Stable fixes (redoing #162)

[Xarthisius]

No description provided.

[codecov]

Codecov Report

Merging #164 into stable will increase coverage by 42.96%.
The diff coverage is 96.29%.

@@             Coverage Diff             @@
##           stable     #164       +/-   ##
===========================================
+ Coverage   38.68%   81.65%   +42.96%     
===========================================
  Files          18       18               
  Lines        1282     1330       +48     
===========================================
+ Hits          496     1086      +590     
+ Misses        786      244      -542

Impacted Files	Coverage Δ
server/schema/tale.py	100% <ø> (ø)	⬆️
server/models/instance.py	37.25% <ø> (+13.44%)	⬆️
server/constants.py	76.47% <100%> (+3.13%)	⬆️
server/dataone_register.py	67.09% <100%> (+5.16%)	⬆️
server/rest/tale.py	87.75% <100%> (+43.79%)	⬆️
server/rest/instance.py	78.12% <88.88%> (+30.85%)	⬆️
server/__init__.py	88.33% <90%> (+46.22%)	⬆️
server/models/tale.py	89.39% <97.14%> (+63.93%)	⬆️
... and 13 more

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