Test variable for falsiness without generating a warning

All,

I've got a template where a variable may be either undefined or false 
(or other values) and I'm specifically trying to determine if it's 
*false*. My template code looks like this:

#if($value && true == $value)
do stuff
#elseif(false == $value)
do other stuff
#end

I don't seem to be able to get rid of the warning in the log file if 
$value is actually null.

Is it possible? Typically, you'd do something like:


#if($value)
stuff when value is defined and/or truthy
#else
stuff when value is undefined and/or falsey
#end

But I'm interested in telling the difference between (boolean) false and 
'undefined'.

Any ideas? Or should I just live with the log message? In production, 
these things don't generate logs, but in development they do. I'd just 
like to reduce the noise in dev if possible.

-chris