fix(#83): prevent crash when unexpected parameter is provided to export-block

[rasendubi]

Fixes #83

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Latest commit: 6c1d0903699f90ebd1dad5102ac9821132e37696

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

| Name | Type | | -------------- | ----- | | uniorg-parse | Patch | | @uniorgjs/orgx | Patch |

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