[patch+7.8?] Fix crash on Python frame filters with unreadable arg

[Phil Muldoon]

On 19/08/14 22:56, Jan Kratochvil wrote:
> Hi,
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1126177
>
> ERROR: AddressSanitizer: SEGV on unknown address 0x000000000050 (pc 0x000000992bef sp 0x7ffff9039530 bp 0x7ffff9039540 T0)
>     #0 0x992bee in value_type .../gdb/value.c:925
>     #1 0x87c951 in py_print_single_arg python/py-framefilter.c:445
>     #2 0x87cfae in enumerate_args python/py-framefilter.c:596
>     #3 0x87e0b0 in py_print_args python/py-framefilter.c:968

Thanks for doing this.  From my point of view it looks fine.

Cheers

Phil