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Check for a non-nil table before referencing its values.

Author Johnny C. Lam <jlam88@gmail.com>
Author date 2014-07-18 17:11:52
Author local date 2014-07-18 13:11:52 -0400
Committer Johnny C. Lam <jlam88@gmail.com>
Committer date 2014-07-18 20:29:46
Committer local date 2014-07-18 16:29:46 -0400
Commit 5ca44f6d85a0daa44c8f4f3af27dfebbf61ce902
Tree 0b047cf6092156842d04c0c3bd0e168e9f2ba5f0
Parent 25f46acb7374494e3f9d60e42f3140792c1a3b0a
Check for a non-nil table before referencing its values.

This fixes ticket 395 by @Shalimaar.