Easiest way to do it would be to move the parsing of the [quote] tags to the extraTags function and use a check on mlev to determine whether or not to display the quote. Alternatively, you can use the same method to do as Ill' suggested and display a custom message instead of the quote.
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Search is your friend “I was having a mildly paranoid day, mostly due to the fact that the mad priest lady from over the river had taken to nailing weasels to my front door again.”
Note, though, that any quotes you have in existing posts before you make this change will still be displayed to guests as they were parsed when the record was created in the database.
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Search is your friend “I was having a mildly paranoid day, mostly due to the fact that the mad priest lady from over the river had taken to nailing weasels to my front door again.”