conditions : if-empty
DESCRIPTION
<if-empty> returns true only if the specified variable has not been defined.
PARAMETERS
var - variable to test
EXAMPLES
...
<if-empty var="name">
<txt>
What's your name?
</txt>
</if-empty>
...
<if-empty var="name">
<txt>
What's your name?
</txt>
</if-empty>
...