fix(core): support provide empty avatar src

[ZhukAnna]

Fixes #

https://stackblitz.com/edit/angular-od933e?file=src%2Fapp%2Fapp.template.html

[lumberjack-bot]

Pull request was closed ✔️

All saved screenshots (for current PR) were deleted 🗑️

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.12%. Comparing base (4a26b1a) to head (16954c7).
Report is 403 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9454      +/-   ##
==========================================
- Coverage   75.68%   75.12%   -0.56%     
==========================================
  Files        1216     1234      +18     
  Lines       19068    19423     +355     
  Branches     2091     2065      -26     
==========================================
+ Hits        14432    14592     +160     
- Misses       4592     4786     +194     
- Partials       44       45       +1     

Flag	Coverage Δ
summary	75.12% <ø> (-0.56%)	⬇️

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[bundlemon]

BundleMon

Unchanged files (5)

Status	Path	Size	Limits
✅	demo/browser/main.(hash).js	295.05KB	+10%
✅	demo/browser/vendor.(hash).js	247.33KB	+10%
✅	demo/browser/runtime.(hash).js	43.13KB	+10%
✅	demo/browser/styles.(hash).css	16.27KB	+10%
✅	demo/browser/polyfills.(hash).js	11.18KB	+10%

Total files change +2B 0%

Unchanged groups (1)

Status	Path	Size	Limits
✅	demo/browser/*..js	7.14MB	-

Final result: ✅

View report in BundleMon website ➡️

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