Fix T41201: Blender Crashes when UV Editing

Disable adding snapping point outside of 3D space for now,
visualization of the points is not implemented outside of
this space and silently adding them wouldn't really be a
good idea.

source/blender/editors/transform/transform_snap.c

@@ -658,7 +658,8 @@ static void setSnappingCallback(TransInfo *t)
 
 void addSnapPoint(TransInfo *t)
 {
-	if (t->tsnap.status & POINT_INIT) {
+	/* Currently only 3D viewport works for snapping points. */
+	if (t->tsnap.status & POINT_INIT && t->spacetype == SPACE_VIEW3D) {
 		TransSnapPoint *p = MEM_callocN(sizeof(TransSnapPoint), "SnapPoint");
 
 		t->tsnap.selectedPoint = p;