Check if hierarchySeparator presents in the options object

[igor-dv]

Issue: When using options plugin and not providing the hierarchySeparator it's overridden by a NULL . In this case hierarchy will not created.

What I did

I've added a check for the hierarchySeparator prop is owned by an object.

How to test

TBD

[shilman]

I think this is pretty ugly/confusing code, but tested and it works, and want to get it deployed before more people use 3.2.x

[codecov]

Codecov Report

Merging #1561 into master will increase coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1561      +/-   ##
==========================================
+ Coverage   20.44%   20.45%   +0.01%     
==========================================
  Files         241      241              
  Lines        5248     5245       -3     
  Branches      649      647       -2     
==========================================
  Hits         1073     1073              
- Misses       3677     3679       +2     
+ Partials      498      493       -5

Impacted Files	Coverage Δ
addons/options/src/preview/index.js	0% <0%> (ø)	⬆️
addons/info/src/components/Props.js	37.2% <0%> (ø)	⬆️
...ponents/left_panel/stories_tree/tree_decorators.js	30.88% <0%> (ø)	⬆️
lib/ui/src/modules/ui/libs/hierarchy.js	45.45% <0%> (ø)	⬆️
lib/ui/src/modules/api/configs/init_api.js	40.47% <0%> (ø)	⬆️
addons/info/src/components/Node.js	38.88% <0%> (ø)	⬆️
addons/knobs/src/components/types/Object.js	5.81% <0%> (ø)	⬆️
app/react/src/client/preview/error_display.js	0% <0%> (ø)	⬆️
addons/knobs/src/components/types/Select.js	7.81% <0%> (ø)	⬆️
addons/info/src/components/markdown/code.js	24.13% <0%> (ø)	⬆️
... and 12 more

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[usulpro]

OMG! Thanks for fixing this! ❤️

[igor-dv]

👍