fix: handle null values for filter button

[codecov[bot]]

Codecov Report

Merging #2421 (8cb0e0b) into main (df5b00c) will increase coverage by 0.02%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2421      +/-   ##
==========================================
+ Coverage   82.96%   82.98%   +0.02%     
==========================================
  Files         921      921              
  Lines       20557    20558       +1     
  Branches     3245     3245              
==========================================
+ Hits        17056    17061       +5     
+ Misses       3379     3375       -4     
  Partials      122      122              

Files Changed	Coverage Δ
...-button-wrapper/filter-button-wrapper.component.ts	100.00% <ø> (ø)
...filtering/filter-button/filter-button.component.ts	72.22% <100.00%> (+25.16%)	:arrow_up:

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Unit Test Results

       4 files  ±0     310 suites  ±0   45m 24s :stopwatch: - 8m 54s 1 126 tests ±0  1 126 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  1 136 runs  ±0  1 136 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit 8cb0e0bd. ± Comparison against base commit df5b00c2.

[github-actions[bot]]

Unit Test Results

       4 files  ±0     310 suites  ±0   49m 26s :stopwatch: - 4m 52s 1 126 tests ±0  1 126 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  1 136 runs  ±0  1 136 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit df15d513. ± Comparison against base commit df5b00c2.