Remove dependence on Image_filename for image selector

[egrace479]

Displaying sample images required both image_filename and file_url columns. This was an unnecessary complication that is removed in this PR.

Also prints a more specific message when no images are displayed (indicating there are no such entries vs. there are no displayable images for those X entries). This isn't a change in options, just a change in the message itself for greater clarity.

[egrace479]

I also noticed a bug in the dropdown selector: if you go from specifying subspecies to selecting Any-<species> for the subspecies, then it will not recognize the Any, as it is returned at this stage as a list (['Any']) instead of a string ('Any'), which is the initial return. This is a result of the check for type that was inserted (at line 142 in the updated components/query.py) to address instances of people not removing the "Any" condition when selecting more subspecies (assuming they'd want the specified options). This is something I intend to fix and update in another PR to dev for further testing before updating main and generating a new release.

[johnbradley]

LGTM, just one spelling fix.

[thompsonmj]

LGTM with a few EOF newlines

[hlapp]

See one nitpicking suggestion :-)