Attempting to check for empty hand with Bedrock's "hasitem" selector argument

hasitem.md

Syntax Errors

hasitem={location=slot.weapon.mainhand}
hasitem={location=slot.weapon.mainhand,quantity=0}

• Doesn't work: item must be specified

Air Item

hasitem={location=slot.weapon.mainhand,item=air}
hasitem={location=slot.weapon.mainhand,item=air,quantity=1..}

• Doesn't work: doesn't find player with empty hand or with filled hand

hasitem={location=slot.weapon.mainhand,item=air,quantity=0}

• Doesn't work: finds both player with empty hand and with filled hand

Some Other Item

hasitem={location=slot.weapon.mainhand,item=stone,quantity=0}

• Doesn't work: doesn't find player holding stone, but finds player with empty hand or holding anything else