fix #1688 (error in booking list when user deleted)

[hansmorb]

closes #1688

[github-actions]

Download built plugin zip
Test Plugin in Wordpress Playground

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 54.01%. Comparing base (ed0ac9e) to head (4cee35c).
Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Wordpress/CustomPostType/Booking.php	0.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1755      +/-   ##
============================================
+ Coverage     53.61%   54.01%   +0.39%     
- Complexity     2628     2630       +2     
============================================
  Files            98       98              
  Lines         12122    12127       +5     
============================================
+ Hits           6499     6550      +51     
+ Misses         5623     5577      -46     

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