fix: headless server no longer throws NPE on null configs #4119
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Description
Fixes #4114
Cause: #4114 (comment)
This other commit already fixes the problem by removing the config that was being set to null anyways.
2893241#diff-7848c43dbebc7bc8c45c12b2c1e2689cR247
This fix should still go in to prevent something like this from breaking headless mode again. Keys can't be null because the KsqlConfig would throw an exception if they weren't so we only need to check value.
Testing done
Spun up headless mode
Added a unit test
Reviewer checklist