Fix bogus null record bug.

[benanhalt]

This is a bug I found in the course of tracking down something else. It is illustrated by the testcase at

specify7/specifyweb/workbench/upload/tests/test_bugs.py

Line 23 in 44feeb4

def test_bogus_null_record(self) -> None:

[realVinayak]

Resolved in #4929. Funnily, I wasn't thinking of resolving this. The implemenation was done independent of it, and was surprised when it said a testcase that shouldn't have passed did