Hi Armin,
I disabled that specific job for you. We'll probably tear down all the electric jobs soon too.
In general the devel builds should always work. The general solution is to create a branch of the last electric compatible tag and set the development branch in electric.rosdistro to point to that branch. That way the build farm stays happy and in the case you want to backport a patch there's an obvious landing place.
We're starting to recommend that instead of developing on trunk/master/default that developers develop in groovy-devel or whatever so that there's no need to rename branches etc come release time.