VP-943 Use exists instead of isEmpty

[tyrannosaurusjames]

I do solemnly swear that I have:

• Run npm test and all the tests pass.
• Run npm run lint and there are no warnings.
• Not decreased the overall test coverage?
• Included the Jira ID and description in the PR title

Proposed Changes? 🤔

1. Fix a deprecation warning that was being generated while running unit tests

Additional info

Enzyme has deprecated use of isEmpty and recommend using exists instead.

There is a brief discussion of the deprecation here: enzymejs/enzyme#705

[codecov]

Codecov Report

Merging #544 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #544   +/-   ##
======================================
  Coverage    80.8%   80.8%           
======================================
  Files         230     230           
  Lines        3439    3439           
======================================
  Hits         2779    2779           
  Misses        660     660

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