Try to fix exception with empty config names

pdm.lock

@@ -2,10 +2,10 @@
 # It is not intended for manual editing.
 
 [metadata]
-groups = ["default", "hf-cli"]
+groups = ["default", "hf-cli", "plots"]
 strategy = ["inherit_metadata"]
 lock_version = "4.5.0"
-content_hash = "sha256:a6d66424dba25e1753c2f45fe7d765c760a111cfe9beaa21771316b6afbbedf3"
+content_hash = "sha256:6c06dbf1e4ba5b232ed2e5e26fdc62b34377f8154f6e408483ddff84f4425ef6"
 
 [[metadata.targets]]
 requires_python = ">=3.13"
@@ -331,6 +331,74 @@ files = [
     {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
 ]
 
+[[package]]
+name = "contourpy"
+version = "1.3.3"
+requires_python = ">=3.11"
+summary = "Python library for calculating contours of 2D quadrilateral grids"
+groups = ["default", "plots"]
+dependencies = [
+    "numpy>=1.25",
+]
+files = [
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+    {file = "contourpy-1.3.3.tar.gz", hash = "sha256:083e12155b210502d0bca491432bb04d56dc3432f95a979b429f2848c3dbe880"},
+]
+
+[[package]]
+name = "cycler"
+version = "0.12.1"
+requires_python = ">=3.8"
+summary = "Composable style cycles"
+groups = ["default", "plots"]
+files = [
+    {file = "cycler-0.12.1-py3-none-any.whl", hash = "sha256:85cef7cff222d8644161529808465972e51340599459b8ac3ccbac5a854e0d30"},
+    {file = "cycler-0.12.1.tar.gz", hash = "sha256:88bb128f02ba341da8ef447245a9e138fae777f6a23943da4540077d3601eb1c"},
+]
+
 [[package]]
 name = "datasets"
 version = "4.3.0"
@@ -408,6 +476,41 @@ files = [
     {file = "filelock-3.20.0.tar.gz", hash = "sha256:711e943b4ec6be42e1d4e6690b48dc175c822967466bb31c0c293f34334c13f4"},
 ]
 
+[[package]]
+name = "fonttools"
+version = "4.60.1"
+requires_python = ">=3.9"
+summary = "Tools to manipulate font files"
+groups = ["default", "plots"]
+files = [
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+]
+
 [[package]]
 name = "frozenlist"
 version = "1.8.0"
@@ -779,6 +882,67 @@ files = [
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 ]
 
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+version = "1.4.9"
+requires_python = ">=3.10"
+summary = "A fast implementation of the Cassowary constraint solver"
+groups = ["default", "plots"]
+files = [
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 requires_python = ">=3.11"
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 requires_python = ">=3.8"
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 summary = "Powerful data structures for data analysis, time series, and statistics"
-groups = ["default"]
+groups = ["default", "plots"]
 dependencies = [
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 requires_python = ">=3.9"
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 summary = "Extensions to the standard Python datetime module"
-groups = ["default"]
+groups = ["default", "plots"]
 dependencies = [
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-groups = ["default"]
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 files = [
     {file = "pytz-2025.2-py2.py3-none-any.whl", hash = "sha256:5ddf76296dd8c44c26eb8f4b6f35488f3ccbf6fbbd7adee0b7262d43f0ec2f00"},
     {file = "pytz-2025.2.tar.gz", hash = "sha256:360b9e3dbb49a209c21ad61809c7fb453643e048b38924c765813546746e81c3"},
@@ -1621,6 +1845,22 @@ files = [
     {file = "safehttpx-0.1.7.tar.gz", hash = "sha256:db201c0978c41eddb8bb480f3eee59dd67304fdd91646035e9d9a720049a9d23"},
 ]
 
+[[package]]
+name = "seaborn"
+version = "0.13.2"
+requires_python = ">=3.8"
+summary = "Statistical data visualization"
+groups = ["default", "plots"]
+dependencies = [
+    "matplotlib!=3.6.1,>=3.4",
+    "numpy!=1.24.0,>=1.20",
+    "pandas>=1.2",
+]
+files = [
+    {file = "seaborn-0.13.2-py3-none-any.whl", hash = "sha256:636f8336facf092165e27924f223d3c62ca560b1f2bb5dff7ab7fad265361987"},
+    {file = "seaborn-0.13.2.tar.gz", hash = "sha256:93e60a40988f4d65e9f4885df477e2fdaff6b73a9ded434c1ab356dd57eefff7"},
+]
+
 [[package]]
 name = "semantic-version"
 version = "2.10.0"
@@ -1648,7 +1888,7 @@ name = "six"
 version = "1.17.0"
 requires_python = "!=3.0.*,!=3.1.*,!=3.2.*,>=2.7"
 summary = "Python 2 and 3 compatibility utilities"
-groups = ["default"]
+groups = ["default", "plots"]
 files = [
     {file = "six-1.17.0-py2.py3-none-any.whl", hash = "sha256:4721f391ed90541fddacab5acf947aa0d3dc7d27b2e1e8eda2be8970586c3274"},
     {file = "six-1.17.0.tar.gz", hash = "sha256:ff70335d468e7eb6ec65b95b99d3a2836546063f63acc5171de367e834932a81"},
@@ -1781,7 +2021,7 @@ name = "tzdata"
 version = "2025.2"
 requires_python = ">=2"
 summary = "Provider of IANA time zone data"
-groups = ["default"]
+groups = ["default", "plots"]
 files = [
     {file = "tzdata-2025.2-py2.py3-none-any.whl", hash = "sha256:1a403fada01ff9221ca8044d701868fa132215d84beb92242d9acd2147f667a8"},
     {file = "tzdata-2025.2.tar.gz", hash = "sha256:b60a638fcc0daffadf82fe0f57e53d06bdec2f36c4df66280ae79bce6bd6f2b9"},

pyproject.toml

@@ -21,6 +21,10 @@ license = {text = "Apache-2.0"}
 hf-cli = [
     "huggingface-hub[cli]>=1.1.4",
 ]
+plots = [
+    "matplotlib>=3.10.7",
+    "seaborn>=0.13.2",
+]
 
 [build-system]
 requires = ["setuptools>=61.0.0", "wheel"]

src/hf_eda_mcp/tools/analysis.py

@@ -93,6 +93,10 @@ def analyze_dataset_features(
         >>> quality = analysis['data_quality']
         >>> print(f"Overall quality score: {quality['quality_score']:.2f}")
     """
+    # Handle empty strings from Gradio (convert to None)
+    if config_name == "":
+        config_name = None
+    
     # Input validation using centralized validation
     try:
         dataset_id = validate_dataset_id(dataset_id)

src/hf_eda_mcp/tools/metadata.py

@@ -79,6 +79,10 @@ def get_dataset_metadata(dataset_id: str, config_name: Optional[str] = None) ->
         >>> metadata = get_dataset_metadata("glue", config_name="cola")
         >>> print(f"Config: {metadata.get('config_name', 'default')}")
     """
+    # Handle empty strings from Gradio (convert to None)
+    if config_name == "":
+        config_name = None
+    
     # Input validation using centralized validation
     try:
         dataset_id = validate_dataset_id(dataset_id)

src/hf_eda_mcp/tools/sampling.py

@@ -92,6 +92,10 @@ def get_dataset_sample(
         ...                           num_samples=3, config_name="cola")
         >>> print(f"Schema: {sample['schema']}")
     """
+    # Handle empty strings from Gradio (convert to None)
+    if config_name == "":
+        config_name = None
+    
     # Input validation using centralized validation
     try:
         dataset_id = validate_dataset_id(dataset_id)
@@ -206,6 +210,10 @@ def get_dataset_sample_with_indices(
         ValueError: If inputs are invalid
         DatasetServiceError: If sampling fails
     """
+    # Handle empty strings from Gradio (convert to None)
+    if config_name == "":
+        config_name = None
+    
     # Input validation using centralized validation
     try:
         dataset_id = validate_dataset_id(dataset_id)