VENOM-466: Fix crash when right clicking empty contact list

[naxuroqa]

Fixes #466

[codecov-io]

Codecov Report

Merging #469 into release-0.5.3 will decrease coverage by <.01%.
The diff coverage is 0%.

@@               Coverage Diff               @@
##           release-0.5.3   #469      +/-   ##
===============================================
- Coverage           5.91%   5.9%   -0.01%     
===============================================
  Files                 78     78              
  Lines               5262   5263       +1     
===============================================
  Hits                 311    311              
- Misses              4951   4952       +1

Impacted Files	Coverage Δ
src/view/ContactListWidget.vala	0% <0%> (ø)	⬆️

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