cmdutil: satisfy expections in dirstateguard.__del__, even if __init__ fails
Python "delstructors" are terrible - this one because it assumed that __init__ had completed before it was called. That would not necessarily be the case if the repository was read only or broken and saving the dirstate thus failed in unexpected ways. That could give confusing warnings about missing '_active' after failures. To fix that, make sure all member variables are "declared" before doing anything that possibly could fail. [Famous last words.]
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