Fix 'run --no-send'

The --no-send option is implemented by monkey-patching the send function
to one that doesn't actually send.

The signature of the real function has changed, but the null function has not,
causing 'run --no-send' to fail.

This patch updates the null signature to match the real one.
Merge pull request #12 from sdt/bugfix/run-no-send

Fix 'run --no-send'