Stateless components like e.g. this one https://github.com/dmtrKovalenko/material-ui-pickers/blob/master/lib/src/_shared/WithUtils.jsx#L5 don't even have a prototype because they are plain functions. So the old isStateLess() implementation failed with "Uncaught TypeError: Cannot read property 'render' of undefined."

Codecov Report

Merging #266 into 5.0 will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##              5.0     #266   +/-   ##
=======================================
  Coverage   66.66%   66.66%           
=======================================
  Files           8        8           
  Lines          24       24           
=======================================
  Hits           16       16           
  Misses          8        8

Impacted Files	Coverage Δ
src/utils.js	100% <100%> (ø)	:arrow_up:

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