[4.5] Fixed cornercase for recurrent event for organizer and no attendee

[phil-davis]

Backport #728 to 4.5 branch

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.64%. Comparing base (c990e14) to head (83a5d11).
⚠️ Report is 3 commits behind head on 4.5.

Additional details and impacted files

@@            Coverage Diff            @@
##                4.5     #749   +/-   ##
=========================================
  Coverage     98.64%   98.64%           
  Complexity     1938     1938           
=========================================
  Files            71       71           
  Lines          5305     5305           
=========================================
  Hits           5233     5233           
  Misses           72       72           

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