Seems this assert was typoed, and was accidentally asserting the
nullness of something which is definitely not null. This was causing
a number of false negatives when the tests were run with assertions
Note that this commit completely removes the null checking since it
can't do any good: this code would NPE earlier if line was null.
These were failing on CI due to a bad assert. Untag them now that the
offending assert is gone. Note: there my be other tests which are
also clean now that the assert is gone. Will check for them soon.