fix(module:table): show empty state regardless of loading value

[ogix]

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?

Currently when the table is initially loaded (with nzLoading="true") then only table header is shown with loading icon on the top and it does not look good. I've checked React behavior and it shows additionally empty icon in the table body.

Issue Number: N/A

What is the new behavior?

The new behavior shows empty state regardless of loading value. So initially when there is no data and nzLoading="true" is set - it will display empty state together with loading icon.

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[zorro-bot]

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[codecov]

Codecov Report

Merging #6934 (82910a4) into master (d392b2e) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 82910a4 differs from pull request most recent head f7f8904. Consider uploading reports for the commit f7f8904 to get more accurate results

@@            Coverage Diff             @@
##           master    #6934      +/-   ##
==========================================
+ Coverage   89.50%   89.51%   +0.01%     
==========================================
  Files         489      489              
  Lines       15805    15802       -3     
  Branches     2428     2427       -1     
==========================================
- Hits        14146    14145       -1     
+ Misses       1016     1015       -1     
+ Partials      643      642       -1     

Impacted Files	Coverage Δ
components/table/src/table/table.component.ts	90.13% <100.00%> (-0.20%)	⬇️
components/core/util/text-measure.ts	91.30% <0.00%> (+1.73%)	⬆️

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[wenqi73]

LGTM