Custom Meta tags: Handle empty values

I have opened the PR with the fix.
We need tests which I'll add later

Although purpose is clear from the issue title, still the issue summary needs to be updated.

I just tested this functionality and the missing tokens are correctly skipped. Thanks Naveen!

Working fine for me too, after applying #5 the meta tags with empty value are gone.

Won't this remove valid strings which fail empty(), like the number zero?

I think this should be changed to loop over each element of the array and run the old check.

Should I close this as duplicate of 🐛 Improper handling of multiple valued, comma separated tag configs (2.0.*) Active as it is solving in generic way for all plugins

Yes, let's do that.