fix: bug in taxonomy import plan

[rpenido]

WIP

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[pomegranited]

@rpenido I think this issue was addressed by the recently-merged #122 -- it changed the import code to catch generic Exceptions, so we should never see the ValueError here.

We didn't tag a new release with that fix though, so will need to wait until a new release is tagged to run it with the platform.

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[rpenido]

Closed in favor of #126