Fixes #1218 Remove try/except clauses from tests

[lwgray]

This PR fixes #1218 which reported technical debt in which there were several try/except clauses within tests that needed to be removed. This was first identified by @rebeccabilbro in PR #1197

I have made the following changes:

1. Remove try/except statements from tests

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• [X] Have you added/updated unit tests where appropriate?

• [ ] Have you updated the baseline images if necessary?

• [X] Have you run the unit tests using pytest?

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[codecov[bot]]

Codecov Report

Merging #1224 (7ccd8a5) into develop (62423f4) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #1224   +/-   ##
========================================
  Coverage    90.45%   90.45%           
========================================
  Files           91       91           
  Lines         5135     5135           
========================================
  Hits          4645     4645           
  Misses         490      490           

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