[OJS 3.4] you can add an empty keyword

[forgive38]

Describe the bug
Keywords are free text, but you can enter just a space character.
I think OJS must check the content of a keyword

To Reproduce
Go to a submission, keywords field: type a "space" and select it. You get an empty - more precisely only a space - keyword

What application are you using?
OJS 3.4 testdrive / Firefox

Thank you

[Hafsa-Naeem]

Ready for review @asmecher
PR
OJS_main: pkp/pkp-lib##10056 Prevent dropdown from taking whitespace input in autosuggest

[asmecher]

Thanks, @Hafsa-Naeem -- passing to @jardakotesovec to review.

[Hafsa-Naeem]

@jardakotesovec Updated the PR#372 and it's ready for review again

[jardakotesovec]

Merged to main - @asmecher do you want to fix it for 3.4 as well? Just to note - 3.4 is using different components (from vue2 ecosystem)

[asmecher]

I think I'd be OK with leaving the fix for just main, if it's not a trivial backport.