FIX: Move TraitType import, handle API change for NoDefaultSpecified

[effigies]

Summary

Addresses #3157 in maint/1.4.x.

After merging, maint/1.4.x should be merged into master.

List of changes proposed in this PR (pull-request)

Acknowledgment

• (Mandatory) I acknowledge that this contribution will be available under the Apache 2 license.

[codecov]

Codecov Report

Merging #3159 into maint/1.4.x will decrease coverage by 0.33%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           maint/1.4.x    #3159      +/-   ##
===============================================
- Coverage        67.60%   67.27%   -0.34%     
===============================================
  Files              299      299              
  Lines            39503    39506       +3     
  Branches          5219     5219              
===============================================
- Hits             26707    26576     -131     
- Misses           12087    12173      +86     
- Partials           709      757      +48     

Flag	Coverage Δ
#smoketests	50.96% <100.00%> (-2.04%)	⬇️
#unittests	64.86% <100.00%> (+<0.01%)	⬆️

Impacted Files	Coverage Δ
nipype/__init__.py	57.81% <0.00%> (ø)	⬆️

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