fix for  "  - create a volume (ie. add a sphere)  - switch to XYZ view  - select "zoom in to fit the extents of the drawing into the graphics window"  - segfault "
fix for 
"
 - create a volume (ie. add a sphere)
 - switch to XYZ view
 - select "zoom in to fit the extents of the drawing into the graphics window"
 - segfault
"
danheeks/heekscad,danheeks/heekscad,danheeks/heekscad,danheeks/heekscad