Merge branch 'normalattrib-initialize-0' into 'master'

NormalAttrib: default props to 0 instead of undefined

See merge request !61
9 jobs for master in 4 minutes and 22 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed clang-c++11 #75773
Linux

00:02:34

passed cppcheck #75775
Linux

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passed doc #75780
Linux

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passed gcc-c++11 #75772
Linux

00:02:11

passed macos-c++11 #75774
Apple

00:02:57

passed VS2015-32-bit #75779
VS2015

00:01:12

passed VS2015-64-bit #75778
VS2015

00:01:23

passed VS2017-32-bit #75777
VS2017

00:01:09

passed VS2017-64-bit #75776
VS2015

00:01:17