Licenses: Error when trying to save a license without a value

Overview:

Display a more helpful and user friendly error message

Steps to Reproduce:

1. Log into folio-snapshot
2. Make sure that in Settings / Licenses / Terms at least one term is set to be a non-primary term
3. Edit a license record in the Licenses app
4. Choose an optional term via "Add term" button that is of type "Text" (on folio-snapshot for example: "Metadata usage")
5. Try to save without entering text in the value field

Expected Results:

A notice is displayed with a text similar to:

Please fill this in to continue

Actual Results:

An error message is displayed:

{{{"message":"Property customProperties is type-mismatched","path":"","_links":{"self":

{"href":"https://folio-snapshot-okapi.dev.folio.org:8080"}

}}}}

Additional Information:
URL: https://folio-snapshot.dev.folio.org/ 
Interested parties:

ostephens ; Martina Schildt