Update app.py

app.py

@@ -11,11 +11,12 @@ exts = list(df["extension"].unique())
 lang_to_ext = defaultdict(set)
 
 for lang, ext in zip(df["language"], df["extension"]):
-    lang_to_ext[lang].update(ext)
+    if isinstance(ext, str):
+        lang_to_ext[lang].update(ext)
 
 def compute(lang):
     
-    report = f"## Summary:\n\n The `{lang}` language has {len(lang_to_ext[lang])} extensions: {', '.join(['`'+ext+'`' for ext in lang_to_ext[lang] if isinstance(ext, str)])}.\n\n"
+    report = f"## Summary:\n\n The `{lang}` language has {len(lang_to_ext[lang])} extensions: {', '.join(['`'+ext+'`' for ext in lang_to_ext[lang]])}.\n\n"
     df_lang = df[df["language"]==lang]
 
     for i, (ext, example) in enumerate(zip(df_lang["extension"], df_lang["content"])):