Fix for short runs inside (batch)triggerAndWait

[matt-aitken]

If short runs were inside triggerAndWait or batchTriggerAndWait there was a race condition where a checkpoint wouldn't be created in time. In some cases the run wasn't running in the cluster anymore and they got stuck frozen forever.

Changes

• Don't attempt to continue these runs in the cluster if there's no checkpoint.
• When we create the checkpoint try and continue these runs (they won't continue if the sub-runs aren't finished).
• Remove some code that was failing attempts to prevent infinite recursion. It was causing errors in certain conditions where runs would have otherwise succeeded.

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Latest commit: 17994f0

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