Reject the send API call if the given fileInput has not selected files. Fixes #2486.
Reject the send API call if the given fileInput has not selected files. Fixes #2486.

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