Fixed KeyError exception in self._pending_builders.sort(key=lambda bn: self._pending_builders_submitted_at[bn]) #10
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_activityLoopIter() may be executed inside getOldestRequestTime() because of yield. So _pending_builders_submitted_at may be cleared in the middle of the loop in _maybeStartBuildsOn(). Use a local dict to accumulate submitted_at values for new_builders.