[PATCH][gdb] Make execute_command_to_string return string on throw

[Tom Tromey]

>>>>> "Tom" == Tom de Vries <tdevries@suse.de> writes:

Tom> Do you have any idea how I could reproduce the fail you're seeing?

Tom> FWIW, I don't understand the '5' showing up.  The test is using
Tom> execute_fn_to_ui_file which should take care of redirecting things.

It's a mystery to me as well.  I didn't do anything special AFAIK.
I'll try debugging it soon to see if I can come up with something.

Tom