Fix: Create pool with custom image broken

[timotheeguerin]

fix #1677

[codecov]

Codecov Report

Merging #1678 into stable will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           stable    #1678      +/-   ##
==========================================
+ Coverage   63.39%   63.39%   +<.01%     
==========================================
  Files        1237     1237              
  Lines       29106    29107       +1     
  Branches     4519     4519              
==========================================
+ Hits        18452    18453       +1     
  Misses      10623    10623              
  Partials       31       31

Impacted Files	Coverage Δ
app/models/forms/create-pool-model.ts	17.5% <ø> (ø)	⬆️
...p/models/dtos/virtual-machine-configuration.dto.ts	100% <100%> (ø)	⬆️

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