Fix memory leak in vtkPNGWriter when OutOfDiskSpaceError

Change-Id: Ib5f0adc17054a3a4c490bd45c980b7c8d2de932a
Initialize row_pointers

Change-Id: Ie12cce088a6ed29f8c73a39587610db2cdf2e3ee
Add NaN support in web chart rendering

Change-Id: I4b848a00c553f0e5429521245572b526daa0d565
Merge topic 'web-catalyst-add-NaN-support' into master

42746d05 Add NaN support in web chart rendering
Merge topic 'vtkPNGWriter-memory-leak' into master

d5e12400 Initialize row_pointers
adf24a53 Fix memory leak in vtkPNGWriter when OutOfDiskSpaceError