BUG: The vtkTubeFilter assumed data had no verts.

The vtkTubeFilter assumed that the cellId of the first line was
zero, but that is not true if there are any verts in the data set.
The result was that cell scalars were not properly copied from
the input to the output.

Change-Id: Ib62e2080ffe69d3241eb5f43c58ff1ea09e08a39
Merge topic 'tubefilter-cellId-bug' into master

01b4db05 BUG: The vtkTubeFilter assumed data had no verts.
BUG #12994. vtkXMLMultiBlockDataWriter not writing names for leaf nodes.

vtkXMLMultiBlockDataWriter was not saving out names for leaf nodes the the
mulitblock dataset. Names were only being saved for non-leaf nodes. Fixed that.

Change-Id: If68a32d64ad5eab2c5f107a236cba6dfecfe125d
Merge topic '12994-xmlmultiblockwriter-improvements' into master

3a192370 BUG #12994. vtkXMLMultiBlockDataWriter not writing names for leaf nodes.