Report a file path of errored image

[milonline-eu]

https://github.com/SmileyChris/easy-thumbnails/blob/410db9acc437e7d291083f39bb25fcfb0d80b819/easy_thumbnails/files.py#L386

When a file is not available it would be very nice to get the information what path/file is a problem. Something like: if self.file: raise exceptions.InvalidImageFormatError( "The source file does not appear to be an image".format(self.file.path)) else: raise exceptions.InvalidImageFormatError( "The source file does not appear to be an image")