Make Location editable

[vincentwj]

Describe the bug
You cannot delete/edit a Canonical Location unless you also delete all other Non-Canonical Locations

To Reproduce
Steps to reproduce the behavior:

1. Go to a specific Work, select a specific Publication with more than one Location,
2. Try to delete the Canonical Location or to change its landing page or its Full Text URL

Expected behavior
You should be able to delete/edit any of the locations with having to delete all others.

[rhigman]

This will have to wait until we implement updating (rather than just deleting and re-adding) objects such as locations. A publication cannot be left without a canonical location, so this behaviour is intentional to prevent this from occurring.

[vincentwj]

Understood!

[rhigman]

This is becoming more pertinent as Thoth Plus ramps up. Example:

• Publisher enters canonical location with Full Text URL that points to an HTML page, not a PDF (Consider adding check to Location fullTextUrl field to ensure it points directly to file #439)
• Thoth Plus then disseminates to some additional platforms on publisher's behalf and adds them as non-canonical locations
• Thoth Dissemination Service attempts to disseminate to Internet Archive (currently still only monthly) and fails due to the Full Text URL issue
• Publisher's responsibility to correct canonical location to allow IA resubmission, but this now entails correctly deleting and re-creating additional non-canonical locations not added by them