Tzu-Mainn Chen 352ed23f02 Fix empty association attributes
If an association does not exist, the id methods affected
in this patch will currently fail, as it will attempt to
grab an id of a non-existent attribute.

The implemented fix uses the EAFP philosophy.

Change-Id: I97b608bc267963e754d06379d94372d13e7c93fa
2013-10-16 23:26:35 -04:00
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