feat(abc:st): add whether to ignore null or undefined value

[cipchk]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ng-alain/delon/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[ng-alain-bot]

Preview is ready!

[codecov]

Codecov Report

Merging #1515 (278b2ab) into master (923d4f4) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1515      +/-   ##
==========================================
+ Coverage   95.59%   95.62%   +0.02%     
==========================================
  Files         269      269              
  Lines        8409     8412       +3     
  Branches     1630     1632       +2     
==========================================
+ Hits         8039     8044       +5     
+ Misses        308      307       -1     
+ Partials       62       61       -1     

Impacted Files	Coverage Δ
packages/abc/st/st.config.ts	100.00% <ø> (ø)
packages/abc/st/st-data-source.ts	100.00% <100.00%> (ø)
packages/theme/src/services/title/title.service.ts	100.00% <0.00%> (+2.85%)	⬆️

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