Fix crash using transform with grease pencil without an "area"

source/blender/editors/transform/transform_generics.cc

@@ -220,7 +220,7 @@ void initTransInfo(bContext *C, TransInfo *t, wmOperator *op, const wmEvent *eve
 
   /* Grease Pencil editing context. */
   if (t->obedit_type == OB_GREASE_PENCIL && object_mode == OB_MODE_EDIT &&
-      (area->spacetype == SPACE_VIEW3D))
+      ((area == nullptr) || (area->spacetype == SPACE_VIEW3D)))
   {
     t->options |= CTX_GPENCIL_STROKES;
   }