Add variable for filtering return values in 'query_data_and_generate_dataframe'

cdplib/db_handlers/MongodbHandler.py

@@ -268,9 +268,9 @@ class MongodbHandler:
 
         try:
             if attribute == None or attribute_value == None:
-                data = self._database[collection_name].find({},return_value)
+                data = self._database[collection_name].find({},return_values)
             else:
-                data = self._database[collection_name].find({attribute: {comparison_operator: attribute_value}}, return_value)
+                data = self._database[collection_name].find({attribute: {comparison_operator: attribute_value}}, return_values)
 
         except Exception as error:
             self._log.log_and_raise_error(('An error occured trying to query data from {}, with query {}: {}:{}. \nError:{}').format(collection_name, attribute, comparison_operator, attribute_value, error))