When a user clears a tag value and presses Done, RawAutocomplete's
onFieldSubmitted auto-selects the first option from the suggestions
list. Since optionsBuilder returns all suggestions for empty text,
this causes the cleared value to reappear. Guarding the call on
non-empty text prevents the auto-selection while preserving
autocomplete behavior when the user has typed a partial match.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>