Remove reference to undeclared object.
Fix keyerror from not finding ASOURL. Related to #4486.
Merge pull request #4488 from annawoodard/master

Fix keyerror from not finding ASOURL; remove broken reference
Fix message for wrong CMSSW releases
Merge branch 'master' into outputdataset_to_task_table

Conflicts:
	src/python/CRABInterface/HTCondorDataWorkflow.py