Modified allowed values validator so it can accept lazy fields

[tclose]

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Summary

Disables checking on allowed values when lazy field is passed to the attribute

[codecov[bot]]

Codecov Report

Base: 77.08% // Head: 77.08% // No change to project coverage :thumbsup:

Coverage data is based on head (77e9a25) compared to base (86671ad). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #576   +/-   ##
=======================================
  Coverage   77.08%   77.08%           
=======================================
  Files          20       20           
  Lines        4320     4320           
  Branches     1215     1215           
=======================================
  Hits         3330     3330           
  Misses        802      802           
  Partials      188      188           

Flag	Coverage Δ
unittests	76.99% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pydra/engine/helpers.py	79.90% <100.00%> (ø)

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