Fix clippy::question_mark warnings

[ronnodas]

These were affecting the CI in every recent PR, and the resulting code does seem better. All were instances of the question_mark lint.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.85%. Comparing base (6814180) to head (997b172).
⚠️ Report is 218 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1128      +/-   ##
==========================================
- Coverage   94.38%   93.85%   -0.54%     
==========================================
  Files          48       52       +4     
  Lines        6665     6673       +8     
==========================================
- Hits         6291     6263      -28     
- Misses        374      410      +36     

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