Don't send start or completion notifications if the message is empty or null. Allows greater flexibility for other plugins.
Merge pull request #6 from sbrandwoo/patch-1

Avoid sending blank messages
Fixed Java 6 dependency; better, consistent naming of methods
fixed test
Test for the Matrix-job notification
Raise required core to Jenkins 1.409
Other plugin and dependency updates
updated maven pom to use repo.jenkins-ci.org repository
fixed warnings
- defer decision if build is already in queue to project#scheduleBuild method which also handles parametrized projects correctly
- use isBuildable instead of isDisabled to check if project may be build currently
suppress compiler warnings
Fixed error in boolean logic
fixed tests
Fixed incompatibility between Jabber and IRC plugin regarding configuration parameters [JENKINS-10589]
[maven-release-plugin] prepare release instant-messaging-1.22
[maven-release-plugin] prepare for next development iteration
Update Jenkins requirements to 1.466
[maven-release-plugin] prepare release instant-messaging-1.23
[maven-release-plugin] prepare for next development iteration
plugin and dependency updates
replace BuildHelper.getResultDescription with ResultTrend.getResultTrend