Sculpt: Fix T101430: Blank stroke undo steps corrupt dyntopo

Blank brush strokes never have an oppurtunity to initialize
a sculpt undo step, which results in blank global undo steps.
These confuse DynTopo's internal BMLog undo stack.

Note: I tried having the stroke operator return OPERATOR_CANCELLED,
but this didn't prevent the undo push (which is done automatically
due to the presence of OPTYPE_UNDO in the operator flags).
I might investigate removing the flag, but that might cause other
problems.

0 files changed, 0 insertions, 0 deletions