Cli update command version null check added

[ahmetfarukulu]

No description provided.

[codecov]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (be260f7) 51.59% compared to head (ae3eb14) 51.73%.
Report is 33 commits behind head on rel-8.0.

Files	Patch %	Lines
...ectModification/VoloNugetPackagesVersionUpdater.cs	0.00%	16 Missing ⚠️
...bp.Cli.Core/Volo/Abp/Cli/Commands/UpdateCommand.cs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           rel-8.0   #18630      +/-   ##
===========================================
+ Coverage    51.59%   51.73%   +0.14%     
===========================================
  Files         3073     3075       +2     
  Lines        96904    96951      +47     
  Branches      7710     7716       +6     
===========================================
+ Hits         50001    50161     +160     
+ Misses       45372    45255     -117     
- Partials      1531     1535       +4     

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