added check if categoricalDtype for issue #19278

[xchoudhury]

Checklist for other PRs:

• closes Behaviour of Categorical inputs to sparse data structures #19278
• tests added / passed
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[pep8speaks]

Hello @xchoudhury! Thanks for updating the PR.

Cheers ! There are no PEP8 issues in this Pull Request. 🍻

Comment last updated on April 10, 2018 at 03:36 Hours UTC

[codecov]

Codecov Report

Merging #20644 into master will decrease coverage by <.01%.
The diff coverage is 28.57%.

@@            Coverage Diff             @@
##           master   #20644      +/-   ##
==========================================
- Coverage   91.83%   91.83%   -0.01%     
==========================================
  Files         153      153              
  Lines       49269    49276       +7     
==========================================
+ Hits        45247    45251       +4     
- Misses       4022     4025       +3

Flag	Coverage Δ
#multiple	90.22% <28.57%> (-0.01%)	⬇️
#single	41.9% <14.28%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
pandas/core/sparse/series.py	93.75% <28.57%> (-1.46%)	⬇️
pandas/util/testing.py	84.59% <0%> (+0.2%)	⬆️

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[jreback]

needs

• test
• whatsnew entry (bug fix)

[TomAugspurger]

@xchoudhury can you update?

[jreback]

closing as stale, if you want to continue working, pls ping and we can re-open. you will need to merge master.