ME: added a handler for non-json and non-xml extensions/formats
ME: added test for unsupported format in 'test_form_format' test case
Merge branch '477-accessing-csvzip-extension-on-forms-api-triggers-an-exception'

* 477-accessing-csvzip-extension-on-forms-api-triggers-an-exception:
  ME: added test for unsupported format in 'test_form_format' test case
  ME: added a handler for non-json and non-xml extensions/formats