fix: ingress do not watching any namespace when namespaceSelector is empty

[gxthrj]

…empty

Please answer these questions before submitting a pull request

• Why submit this pull request?

• Bugfix

• New feature provided

• Improve performance

• Backport patches

• Related issues
  bug: The newly created namespace will not be watched #741

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[chzhuo]

In the method initWatchingNamespaceByLabels, The watchingNamespace will be filled .

[gxthrj]

In the method initWatchingNamespaceByLabels, The watchingNamespace will be filled .

Yes， I just get your point, the newly created namespace will fail to watch.

[codecov-commenter]

Codecov Report

Merging #742 (29fb2f6) into master (4a862e2) will increase coverage by 0.08%.
The diff coverage is 81.81%.

@@            Coverage Diff             @@
##           master     #742      +/-   ##
==========================================
+ Coverage   31.70%   31.78%   +0.08%     
==========================================
  Files          66       66              
  Lines        6640     6648       +8     
==========================================
+ Hits         2105     2113       +8     
  Misses       4280     4280              
  Partials      255      255              

Impacted Files	Coverage Δ
pkg/ingress/compare.go	0.00% <0.00%> (ø)
pkg/ingress/controller.go	1.01% <0.00%> (ø)
pkg/api/validation/utils.go	44.44% <100.00%> (+12.01%)	⬆️
pkg/types/labels.go	100.00% <100.00%> (ø)

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[tao12345666333]

ping @gxthrj any update?