Error messages in debug on 3.0

[Phil Mayers]

I've just ported our config to 3.0 and I'm seeing a few error messages; 
they don't seem to be critical but are concerning me.

Specifically I'm seeing:

ERROR: Conditional evaluation failed due to internal sanity check.

...whenever I try to compare against absent attributes. What's the 
correct syntax for this now - do I need:

if ((Attr) && (Attr op RHS)) {

...or can I ignore the message?


I'm also seeing this with:

if ("%{outer.request:Blah}")

...if I'm not in a tunnel (in some generic logging policy); what's the 
right syntax for that?