Fixed false positives of missing layers due to support layer snapping to avoid layers thinner than min_layer height, and possibly due to the fact, that empty support extrusions may get generated for support layers with non-empty support polygons.
Fixed false positives of missing layers due to support layer snapping
to avoid layers thinner than min_layer height, and possibly due to
the fact, that empty support extrusions may get generated
for support layers with non-empty support polygons.

Fix of Empty layers detection added to GCode.cpp (6ab1cec)

prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r