TBIO-4316: Added AJAX error handling. Optimisations made in Conversions.imageToBlob mean we no longer receive a 'tainted canvas' error on images edited without a proxy. In fact not handling this case means never received an error at all due to the unresolved promise.
TBIO-4316: Added AJAX error handling. Optimisations made in Conversions.imageToBlob mean we no longer receive a 'tainted canvas' error on images edited without a proxy. In fact not handling this case means never received an error at all due to the unresolved promise.

FernCreek/tinymce,TeamupCom/tinymce,tinymce/tinymce,tinymce/tinymce,FernCreek/tinymce,TeamupCom/tinymce,FernCreek/tinymce,tinymce/tinymce