fix(module:list): fix invalid render empty style when unspecified data source

[cipchk]

• update vertical demo, list 里的分页完全没反应，是不是有bug，  #2385

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: N/A

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

Merging #2415 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2415      +/-   ##
==========================================
- Coverage   95.85%   95.84%   -0.01%     
==========================================
  Files         485      485              
  Lines       12299    12299              
  Branches     1671     1671              
==========================================
- Hits        11789    11788       -1     
  Misses        150      150              
- Partials      360      361       +1

Impacted Files	Coverage Δ
components/list/nz-list.component.ts	100% <100%> (ø)	⬆️
components/time-picker/time-holder.ts	95.91% <0%> (-1.03%)	⬇️

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