If there is no prefix in your config.php file, why would you then want to assume it is "vb_"? Just use no prefix (if the table is called "attachments" then call it "attachments", not "vb_attachments"). As for what will happen if you use a prefix and there is no table with that name (like "vb_attachments"), you'll get a database error "No table called whatever.vb_attachments" (or however it is worded).
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