fix: Do not log error when visitors are disabled.

[bgrozev]

No description provided.

[codecov]

Codecov Report

Merging #1049 (96b6eee) into master (aafb61b) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1049      +/-   ##
============================================
- Coverage     27.29%   27.27%   -0.02%     
  Complexity      477      477              
============================================
  Files           124      124              
  Lines          7442     7443       +1     
  Branches       1059     1060       +1     
============================================
- Hits           2031     2030       -1     
- Misses         5157     5158       +1     
- Partials        254      255       +1     

Impacted Files	Coverage Δ
...otlin/org/jitsi/jicofo/xmpp/ConferenceIqHandler.kt	54.11% <0.00%> (-1.84%)	⬇️

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