[stable23] do not generate link if no front-end

[backportbot-nextcloud]

backport of #1048

[codecov-commenter]

Codecov Report

Merging #1061 (ad57547) into stable23 (f6a4fc0) will decrease coverage by 0.00%.
The diff coverage is 30.00%.

❗ Current head ad57547 differs from pull request most recent head 22767fa. Consider uploading reports for the commit 22767fa to get more accurate results

@@              Coverage Diff              @@
##             stable23   #1061      +/-   ##
=============================================
- Coverage        0.70%   0.70%   -0.01%     
- Complexity       5736    5739       +3     
=============================================
  Files             290     290              
  Lines           19838   19839       +1     
=============================================
  Hits              139     139              
- Misses          19699   19700       +1     

Impacted Files	Coverage Δ
lib/Service/RemoteStreamService.php	0.00% <0.00%> (ø)
lib/Tools/Traits/TStringTools.php	0.00% <0.00%> (ø)
lib/Model/ModelManager.php	2.10% <60.00%> (-0.03%)	⬇️
lib/Command/CirclesCreate.php	0.00% <0.00%> (ø)

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