Fix in restapi if custom schema is not defined for node

[waychal]

No description provided.

[codecov-io]

Codecov Report

Merging #1485 into develop will increase coverage by <.01%.
The diff coverage is 65.62%.

@@             Coverage Diff             @@
##           develop    #1485      +/-   ##
===========================================
+ Coverage    56.75%   56.75%   +<.01%     
===========================================
  Files          277      277              
  Lines        34058    34082      +24     
===========================================
+ Hits         19329    19343      +14     
- Misses       14729    14739      +10

Impacted Files	Coverage Δ
aiida/restapi/translator/node.py	46.89% <37.5%> (-0.33%)	⬇️
aiida/restapi/translator/user.py	80.95% <75%> (-5.72%)	⬇️
aiida/restapi/translator/group.py	80.95% <75%> (-5.72%)	⬇️
aiida/restapi/translator/computer.py	85.71% <75%> (-7.62%)	⬇️

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[ltalirz]

@waychal Please recreate these fixes on top of release_v0.12.1 (it can take a very long time until develop will be released)

[ltalirz]

Closed in favor of #1490 , based on release_v0.12.1