Getting "Revision with ID not found." (when submitting depicts statement when there are none yet, nor are there captions) and "Invalid claim guid." (when there are captions, but no depicts yet) errors in labs, when submitting depicts statements

Expected behavior:

When trying to add a depicts statement to a file on Labs/Alpha, no system errors are seen if it's a valid entry.

For a list of recently uploaded files to test with on Labs/Alpha, try this link and open the "Upload Log" accordions or click on any links prefixed with "File:"

Acceptance criteria:

• Adding a depicts statement to a file that has no captions and no depicts statements yet works (instead of getting a "Revision with ID not found" error)
• Adding a depicts statement to a file that already has captions but no other depicts statements yet works (instead of getting a "Invalid claim guid" error)