Extends error response

Author: quanganh

lib/moodle_rb/utility.rb

@@ -29,7 +29,7 @@ def key_value_query_format(hash)
 
     def check_for_errors(response)
       return unless error_response?(response)
-      raise MoodleError.new(response.parsed_response)
+      raise MoodleError.new(response.parsed_response.presence || response.response.inspect)
     end
 
     private