Handle failed uploads without a defined dataType. Fixes #2333.
Handle failed uploads without a defined dataType. Fixes #2333.

blueimp/jQuery-File-Upload,Verde1705/verde1705.github.io,blueimp/jQuery-File-Upload,Verde1705/verde1705.github.io,GrizliK1988/PhotoWidget,blueimp/jQuery-File-Upload,blueimp/jQuery-File-Upload,blueimp/jQuery-File-Upload,blueimp/jQuery-File-Upload