qapi: [trivial] Do not catch unknown exceptions in "test-qapi.py"

Signed-off-by: NLluís Vilanova <vilanova@ac.upc.edu>
Reviewed-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>

tests/qapi-schema/test-qapi.py

@@ -18,9 +18,6 @@ try:
     exprs = parse_schema(sys.stdin)
 except SystemExit:
     raise
-except:
-    print >>sys.stderr, "Crashed:", sys.exc_info()[0]
-    exit(1)
 
 pprint(exprs)
 pprint(enum_types)