Catch block smells like leftover debugging code

...especially as it doesn't change hr from S_OK, and compiling with /EHsc
(instead of /EHa) reveals that OleRun does not throw any (C++) exceptions (and
thus produces an "unreachable code" warning for the catch block).

Change-Id: Ic34e83e6ede3a214ccb073e3e54d6fcc493d46ea