Do not swallow BrokenPostRequestException

Wolfgang Zieglerrequested to merge
issue/canvas-3591989:3591989-form-ajax-errors-are-swalloed-by-canvas into 1.x

Avoids swallowing the exception thrown by form ajax handling: BrokenPostRequestException

Testing instructions

  • create webform block, place in canvas
  • open the page with ?ajax_form=1 (normal GET request)
  • this should result in an error that is not swallowed

Closes #3591989

Edited by Wolfgang Ziegler

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