Thanks to @Ingar for access to his site so that I could "see" what was going on. I've just submitted v1.0.1 of the plugin to the Zen Cart moderators for review and will post back here when it's available for download.
This release contains changes associated with the following GitHub issues:
#5: Advanced Search: Correct MySQL error when sub-categories included.
#6: Advanced Search: Correct "no search results returned" when no tags are defined.
#7: Don't display Tag Cloud sidebox if no tags are defined.
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