fix(module:anchor): fix 'a' tag problem with 'null' or 'undefined' value if templateRef provided

[firefighter-19]

… 'a' tag problem with 'null' or 'undefined' value if templateRef provided

https://stackblitz.com/edit/stackblitz-starters-1rvbyj?file=src%2Fmain.ts

Stackblitz example added.

[zorro-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.95%. Comparing base (c5478f6) to head (883aef8).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #8864   +/-   ##
=======================================
  Coverage   91.95%   91.95%           
=======================================
  Files         537      537           
  Lines       18453    18453           
  Branches     2814     2814           
=======================================
  Hits        16968    16968           
  Misses       1183     1183           
  Partials      302      302           

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[HyperLife1119]

Could you change the commit message to fix(module:anchor): ... ? :)

[firefighter-19]

Could you change the commit message to fix(module:anchor): ... ? :)

fixed :)

[HyperLife1119]

LGTM