[KBK-51] Clear search results when search field is cleared

[aethant]

KBK-51

As a user, I expect that when I clear the search input, the filter will disappear and no content will be presented.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (ce24a58) 88.20% compared to head (316eb97) 88.18%.
Report is 1 commits behind head on master.

❗ Current head 316eb97 differs from pull request most recent head 66f01d3. Consider uploading reports for the commit 66f01d3 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1231      +/-   ##
==========================================
- Coverage   88.20%   88.18%   -0.02%     
==========================================
  Files         274      274              
  Lines        4628     4630       +2     
  Branches     1165     1166       +1     
==========================================
+ Hits         4082     4083       +1     
- Misses        532      533       +1     
  Partials       14       14              

Files	Coverage Δ
...course-home/courseware-search/CoursewareSearch.jsx	68.75% <50.00%> (-2.68%)	⬇️

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[schenedx]

This person no longer works for 2U. Closing the PR.