[stable22] do not generate link if no front-end

[backportbot-nextcloud]

backport of #1048

[codecov-commenter]

Codecov Report

Merging #1062 (d02ad2d) into stable22 (47e54c2) will decrease coverage by 0.00%.
The diff coverage is 30.00%.

❗ Current head d02ad2d differs from pull request most recent head daa42e5. Consider uploading reports for the commit daa42e5 to get more accurate results

@@              Coverage Diff              @@
##             stable22   #1062      +/-   ##
=============================================
- Coverage        0.69%   0.69%   -0.01%     
- Complexity       5712    5715       +3     
=============================================
  Files             289     289              
  Lines           19769   19770       +1     
=============================================
  Hits              138     138              
- Misses          19631   19632       +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	2.13% <60.00%> (-0.03%)	⬇️
lib/Command/CirclesCreate.php	0.00% <0.00%> (ø)

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