In my knowledge you can't check if he has or not any item. You can only check if he has a specific item or item of type/class/level...
As for particular slots, that is easy... there is the trigger that checks if a hero has ITEM (specific, of type, of class, of level) in slot 1/2/3/4/5/6/ANY INTEGER.
You could try, tough:
Check if number of charges remaining in item hold by hero in slot X is equal with 0.
Yet i think that items like, with no charges (example some blades of attack) because they don't have any charges may have the charges remaining number = 0... and would mess up the trigger.
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