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Use helper function to deal with nil arguments to formatted strings.

Author Johnny C. Lam <jlam88@gmail.com>
Author date 2013-03-29 06:50:05
Author local date 2013-03-29 06:50:05 +0000
Committer Johnny C. Lam <jlam88@gmail.com>
Committer date 2013-03-29 06:50:05
Committer local date 2013-03-29 06:50:05 +0000
Commit 6a6ae2e320c2c03e6cca4782c230f0382e82c6b0
Tree 1a56165a7452ccb26650270029f0a92af1d413d0
Parent eac0a5e653b73ac0df9f7c5a58c42cb27118dbf0
Use helper function to deal with nil arguments to formatted strings.

This fixes using the trace functionality to explore the decisions that
Ovale is making.

git-svn-id: svn://svn.curseforge.net/wow/ovale/mainline/trunk@858 d5049fe3-3747-40f7-a4b5-f36d6801af5f