Optimize null filtering

[adamradocz]

Null was filtered twice.

What kind of change does this PR introduce?

Optimization.

What is the current behavior?

The viewModelChanged checked the null twice.

What is the new behavior?

Filters only once.

Other information:

The new version of #3319. That cannot be updated because its branch was deleted.

[codecov]

Codecov Report

Merging #3323 (bd97de9) into main (f6aa117) will decrease coverage by 0.22%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##             main    #3323      +/-   ##
==========================================
- Coverage   63.83%   63.60%   -0.23%     
==========================================
  Files         157      157              
  Lines        5726     5768      +42     
==========================================
+ Hits         3655     3669      +14     
- Misses       2071     2099      +28     

Impacted Files	Coverage Δ
...ngs/Converter/NullableLongToStringTypeConverter.cs	12.50% <0.00%> (-4.17%)	⬇️
...ngs/Converter/NullableByteToStringTypeConverter.cs	66.66% <33.33%> (-11.12%)	⬇️
.../Converter/NullableDecimalToStringTypeConverter.cs	62.96% <33.33%> (-8.47%)	⬇️
...s/Converter/NullableDoubleToStringTypeConverter.cs	62.96% <33.33%> (-8.47%)	⬇️
...gs/Converter/NullableShortToStringTypeConverter.cs	66.66% <33.33%> (-11.12%)	⬇️
...s/Converter/NullableSingleToStringTypeConverter.cs	62.96% <33.33%> (-8.47%)	⬇️
.../Converter/NullableIntegerToStringTypeConverter.cs	79.16% <66.66%> (-4.17%)	⬇️

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[github-actions]

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