nova.exception.wrap_exception will re-raise some exceptions, but in the process of possibly notifying that an exception has occurred, it may clobber the current exception information. nova.utils.to_primitive in particular (used by the notifier code) will catch and handle an exception clobbering the current exception being handled in wrap_exception. Eventually when using the bare 'raise', it will attempt to raise None resulting a completely different and unhelpful exception.

The patch saves the exception at the beginning of wrap_exception and then re-raises the original exception avoiding the possibility of a clobbered exception.

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