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Fix ticket 241 by guarding against a missing script source.

Author	Johnny C. Lam <jlam88@gmail.com>
Author date	2013-05-21 05:10:37
Author local date	2013-05-21 05:10:37 +0000
Committer	Johnny C. Lam <jlam88@gmail.com>
Committer date	2013-05-21 05:10:37
Committer local date	2013-05-21 05:10:37 +0000
Commit	762af6f6da1bd72d247047ec18e3abb64bd6e17d
Tree	e5d482ad976de86b18bae7f5bf2a440092d13fe0
Parent	781de6f471d0abb253383f6807a5511e27045f59

Fix ticket 241 by guarding against a missing script source.

Sometimes, the script source may not be present because the addon that
provided it is removed.  Protect against this by checking for nil tables
appropriately.

git-svn-id: svn://svn.curseforge.net/wow/ovale/mainline/trunk@917 d5049fe3-3747-40f7-a4b5-f36d6801af5f