What is the test for null?

I wrote a custom with an optional x attribute tag.
x is a type of complex object, a string that is empty or not defined.
The following cfif tag gets ERROR: types of complex objects cannot be converted to simple values.

Opps! I double posted. Please see what I wanted to post to 22925 http://www.adobe.com/cfusion/webforums/forum/messageview.cfm?forumid=1&catid=3&threadid=14 & enterthread = y

Tags: ColdFusion

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