fix(Search): corrected bad check on configuration when flattening

[rashley-iqt]

dataset prior to generating the index. fixes #235

Description of proposed changes

search index is now properly created for the Poseidon Datasource

Checklist

_Put an x in the boxes that apply. _

• Lint and unit tests pass locally with my changes
• I have added tests that prove my changes work (if applicable)
• I have added or updated necessary documentation (if appropriate)

Additional comments

No

[codecov]

Codecov Report

Merging #248 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #248      +/-   ##
==========================================
+ Coverage   95.66%   95.67%   +0.01%     
==========================================
  Files          20       20              
  Lines         392      393       +1     
==========================================
+ Hits          375      376       +1     
  Misses         17       17

Impacted Files	Coverage Δ
src/epics/index-dataset-epic.js	98.24% <100%> (+0.03%)	⬆️

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