Resolve "Communicator: Implement Option to use without IceStorm"
Closes #269 (closed)
Implements the Option to run the Communicator without a connection to IceStorm:
- If
None
is passed asIcestormAdminConfig
(made Optional) on Communicator-Initialization the Communicator won't connect to IceStorm. - Introduced
NotConnectedToIcestormException
in ICommunicator which is raised if IceStorm-metrics are requested although the Communicator isn't connected to IceStorm.