[MERGE] Make -Dpack not cause a error trying to use an unkown variable.

[John Arbash Meinel]

John Arbash Meinel has voted approve.
Status is now: Semi-approved
Comment:
this seems trivially correct, I'll just merge

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3C1204480348.16306.22.camel%40flash%3E