fix(module:select): fix keyboard event error when option data is empty

[chenc041]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/NG-ZORRO/ng-zorro-antd/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?

[x] Bugfix
[ ] 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: #7216

What is the new behavior?

Does not do anything, if option data is null

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[zorro-bot]

This preview will be available after the AzureCI is passed.

[codecov]

Codecov Report

Merging #7222 (bc039e7) into master (662648c) will increase coverage by 0.03%.
The diff coverage is 100.00%.

❗ Current head bc039e7 differs from pull request most recent head 229e168. Consider uploading reports for the commit 229e168 to get more accurate results

@@            Coverage Diff             @@
##           master    #7222      +/-   ##
==========================================
+ Coverage   91.72%   91.75%   +0.03%     
==========================================
  Files         486      486              
  Lines       15918    15920       +2     
  Branches     2588     2588              
==========================================
+ Hits        14601    14608       +7     
+ Misses       1004     1001       -3     
+ Partials      313      311       -2     

Impacted Files	Coverage Δ
...mponents/date-picker/date-range-popup.component.ts	95.16% <100.00%> (+1.10%)	⬆️
components/select/select.component.ts	90.82% <100.00%> (+0.63%)	⬆️
components/slider/slider.component.ts	92.27% <100.00%> (+0.02%)	⬆️
components/core/util/text-measure.ts	92.98% <0.00%> (+0.87%)	⬆️

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[wenqi73]

LGTM.