Debugs :
1. If Suspend, Resume, Kill, etc... is called for a node/Running-Service fo a component and if the component was terminated in error, the exception is catched and an error status is returned without crash.
2. If an Engines::Component method is invoked from the GraphExecutor and if the correcponding component crashed, the exeception is catched and an error status is returned without crash.
3. In any of theese case, the node and the graph get the state "ErroredState"
