fixed grey block on upcoming event release version and null error

[MonikaTheiss]

Fixed null error and widget error

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 4.86%. Comparing base (25f4f6f) to head (253b462).
Report is 3 commits behind head on Develop.

Files with missing lines	Patch %	Lines
lib/view/pages/events/view_events_page.dart	0.00%	4 Missing ⚠️
lib/services/events_S/event_service.dart	0.00%	2 Missing ⚠️
lib/view/components/events/joined_event_card.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           Develop    #644   +/-   ##
=======================================
  Coverage     4.86%   4.86%           
=======================================
  Files          130     130           
  Lines         8339    8339           
=======================================
  Hits           406     406           
  Misses        7933    7933           

Flag	Coverage Δ
	4.86% <0.00%> (ø)

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[pieryvdl]

thanks Monika!