This is similar to the fix in signals-test.c that I just commited from
Koosha Khajehmoogahi. I haven't tested it, but it's consistent with
the other signal handler in this file.
#!/bin/sh
METHOD_NAME=$1
iftest-z"$METHOD_NAME"
then
cat<<EOF
This program calls purple API functions using DBus and prints the return value.
If you are not interested in the return value, use purple-send-async.