added fix for empty search string

[kunmi02]

Fixes #1635 (<=== Add issue number here)

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[codeclimate]

Code Climate has analyzed commit 1e8534e and detected 0 issues on this pull request.

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[codecov]

Codecov Report

Merging #1646 (36c1670) into main (4331ef0) will decrease coverage by 1.44%.
The diff coverage is 59.58%.

❗ Current head 36c1670 differs from pull request most recent head 1e8534e. Consider uploading reports for the commit 1e8534e to get more accurate results

@@            Coverage Diff             @@
##             main    #1646      +/-   ##
==========================================
- Coverage   72.98%   71.54%   -1.45%     
==========================================
  Files          40       40              
  Lines        1399     1409      +10     
==========================================
- Hits         1021     1008      -13     
- Misses        378      401      +23     

Impacted Files	Coverage Δ
app/channels/concurrent_editing_channel.rb	0.00% <0.00%> (-83.34%)	⬇️
app/controllers/utility_controller.rb	0.00% <0.00%> (-100.00%)	⬇️
app/helpers/users_helper.rb	21.73% <0.00%> (ø)
app/models/map.rb	92.25% <ø> (-1.30%)	⬇️
app/helpers/application_helper.rb	50.00% <20.00%> (ø)
app/controllers/annotations_controller.rb	59.25% <22.22%> (ø)
app/controllers/sessions_controller.rb	32.91% <22.22%> (ø)
app/controllers/front_ui_controller.rb	74.28% <33.33%> (ø)
app/controllers/application_controller.rb	88.88% <50.00%> (ø)
app/controllers/images_controller.rb	76.54% <61.90%> (ø)
... and 15 more

[cesswairimu]

Fantastic 🎉 Thanks for fixing this @kunmi02

[cesswairimu]

The same error appears if one inputs less than 3 chars, it could be a follow up issue if you would like to work on it. Thanks again, merging now

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[kunmi02]

@cesswairimu Thanks for notifying me about the search character less than 3. I created an issue for it here #1650 . I have a corresponding PR for it