#669 GOP on subpatch can create error

[Cyrille Henry]

using a GOP abstraction on a subpatch can create error when closing the main patch.
(vanilla 0.43 / linux)

(Tcl) INVALID COMMAND NAME: invalid command name ".x1568a80.c"
while executing
".x1568a80.c delete .x1568a80.t1569de0R"
("uplevel" body line 2)
invoked from within
"uplevel #0 $cmd_from_pd"

the attached patch show how to reproduce this error : start master.pd, click on the subpatch to see the abstraction, then close the subpatch and the master patch.

[Cyrille Henry]