list command compatible with newer versions of exist-db

[line-o]

• In newer versions of exist-db the regular expressions are checked if they might match the empty string and raise an error if they do. This resulted in all calls to xst list to fail.

• The recursive variable bound to the query was undefined when both the tree and the recursive option were not set. Since these are conflicting, they cannot be assigned a default value.

[github-actions[bot]]

:tada: This PR is included in version 1.6.2 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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