support specifying noNullPoints and maxDataPoints together

[DanCech]

Fixes #2256

[codecov-io]

Codecov Report

Merging #2257 into master will decrease coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2257      +/-   ##
==========================================
- Coverage   79.61%   79.58%   -0.03%     
==========================================
  Files          85       85              
  Lines        8858     8848      -10     
  Branches     1897     1894       -3     
==========================================
- Hits         7052     7042      -10     
  Misses       1545     1545              
  Partials      261      261

Impacted Files	Coverage Δ
webapp/graphite/render/datalib.py	100% <100%> (ø)	⬆️
webapp/graphite/render/views.py	69.95% <100%> (-0.94%)	⬇️

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