gdb/testsuite/dap: remove catch from dap_read_event

This catch didn't cause me any trouble, but for the same reason as the
preceding patch, I think it's a bit better to just let any exception
propagate, to make for easier debugging.

Change-Id: I1779e62c788b77fef2d50434edf4c3d2ec5e1c4c
1 file changed