Fix for crash on bpy.ops.curve.vertex_add/bpy.ops.curve.extrude

Removed view3d_operator_needs_opengl from addvert_Nurb, which is unneeded here

source/blender/editors/curve/editcurve.c

@@ -3414,7 +3414,6 @@ static int addvert_Nurb(bContext *C, short mode, float location[3])
 	copy_m3_m4(mat, obedit->obmat);
 	invert_m3_m3(imat,mat);
 
-	view3d_operator_needs_opengl(C);
 	findselectedNurbvert(editnurb, &nu, &bezt, &bp);
 	if(bezt==0 && bp==0) return OPERATOR_CANCELLED;