Cannot specify no mimetypes

[btbonval]

I'm working with a codebase which specifies data-fp-extensions.

FilepickerException: Error: Cannot pass in both mimetype and extension parameters to the pick function

I have specified FPFileField.mimetypes to be nothing, None, '', (,), and always it comes back */*. So then I read the code and figured out why:
https://github.com/Ink/django-filepicker/blob/0671c4315b61f897358367a757b6ef8444aa183b/django_filepicker/forms.py#L33

Please specify at least one condition in which mimetypes may be left blank.

On the one hand, you could explicitly check to see if 'data-fp-extensions' in additional_params, in which case mimetypes should not be included.

On the other hand, there might be other instances where mimetypes cause a problem. It might be hard to find all those edge cases. Perhaps add a constant NoMimetypes = object() singleton into forms.py, and do not include mimetypes if mimetypes == NoMimetypes.

[btbonval]

My workaround is to drop this into the code prior to calling FPFileField:

django_filepicker.forms.FPFieldMixin.default_mimetypes = ''

Since I don't know what of the possible solutions would be preferred by devs, I'm not going to submit a pull request on this. The workaround is here in case anyone else has the problem.