raise error if invalid fields requests (closes #835)

Author: tschaume

mp_api/client/core/client.py

@@ -457,6 +457,12 @@ def _query_resource(
             if isinstance(fields, str):
                 fields = [fields]
 
+            invalid_fields = [f for f in fields if f not in self.available_fields]
+            if invalid_fields:
+                raise MPRestError(
+                    f"invalid fields requested: {invalid_fields}. Available fields: {self.available_fields}"
+                )
+
             criteria["_fields"] = ",".join(fields)
 
         try: