BUG: #3323 turn of glyphs when tensor data not available

As described in but #3323, having a scalar (like FA) as the invariant
mode with the glyphs visible leads to a crash.  This appears to be
deep in the pipeline for glyphing. (TODO: fix the pipeline).
So the solution (workaround) here is to turn off any visible slice
glyphs when changing the invarient to anything other than color by
orientation and to disable the glyping panel.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22363 3bd1e089-480b-0410-8dfb-8563597acbee
STYLE: remove some trailing whitespace...

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22364 3bd1e089-480b-0410-8dfb-8563597acbee