This is to let the author of the post know, that this pod is interested
in updates about this post.
The sending user is only used to verify that the participation was sent
from this pod, but lets use an admin/podmin account if available.
closes#7708
ignoring the error message
Previously it returned the return value of Logging::Logger#warn, which
is true for loggers that log the warn level. However
Diaspora::Federation::Receive::receive_relayable checks the return value
for truthiness in order to decide whether to attempt to relay it,
resulting in a NoMethodError: undefined method `parent' for
true:TrueClass in Diaspora::Federation::Receive::relay_relayable
This change is cosmetic as the exception raised prevented any action
that shouldn't happen anyway, so there's no actual logic change.
