feat: handle empty string in displaystring pipe

[codecov[bot]]

Codecov Report

Merging #2413 (eca3b49) into main (aed7549) will decrease coverage by 3.25%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2413      +/-   ##
==========================================
- Coverage   82.87%   79.62%   -3.25%     
==========================================
  Files         921      921              
  Lines       20543    20544       +1     
  Branches     3239     3240       +1     
==========================================
- Hits        17024    16358     -666     
- Misses       3394     4043     +649     
- Partials      125      143      +18     

Files Changed	Coverage Δ
...rc/utilities/formatters/string/string-formatter.ts	51.85% <100.00%> (-48.15%)	:arrow_down:

... and 90 files with indirect coverage changes

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[github-actions[bot]]

Unit Test Results

       4 files  ±0     310 suites  ±0   47m 13s :stopwatch: + 3m 32s 1 123 tests ±0  1 121 :heavy_check_mark:  - 2  0 :zzz: ±0  2 :x: +2  1 133 runs  ±0  1 131 :heavy_check_mark:  - 2  0 :zzz: ±0  2 :x: +2 

For more details on these failures, see this check.

Results for commit eca3b49f. ± Comparison against base commit aed7549f.