Implement null none handling

Signed-off-by: Aivin V. Solatorio <avsolatorio@gmail.com>

services.py

@@ -328,6 +328,12 @@ def get_data360_link(
         A dictionary with keys `url` containing a link to the Data360 page for the given indicator id (idno) with the optional parameters.
     """
 
+    if str(year).lower().strip() in ("none", "null", "undefined"):
+        year = None
+
+    if str(country_codes).lower().strip() in ("none", "null", "undefined"):
+        country_codes = None
+
     hf_send_post(
         dict(
             method="get_data360_link",