fix: Bug in pdl_schema_error_analyzer that raises exception during analysis (#851)

When the PDL doesn't match the schema, the error analysis fails as it attempts to retrieve the field names without verifying that `"properties"` key exists in `ref_type`.

This change returns an empty `dict` if `properties` key doesn't exist in `ref_type` to allow the error analysis to complete successfully.

Signed-off-by: Abi Ullattil <[email protected]>

Author: vite-falcon

src/pdl/pdl_schema_error_analyzer.py

@@ -48,7 +48,7 @@ def get_non_null_type(schema):
 
 
 def match(ref_type, data):
-    all_fields = ref_type["properties"].keys()
+    all_fields = ref_type.get("properties", {}).keys()
     intersection = list(set(data.keys()) & set(all_fields))
     return len(intersection)