Commits on Dec 12, 2014

1. Fixing a small logic bug in diffList …

   It’s not enough to only check if no new value is set. It can also be
   that a new value is set, but contains a variable that cannot be
   interpolated until a depending resource is created during the apply
   fase.
   
   I actually found this one as one of the acceptance tests for the AWS
   ELB resource was failing. It failed with the following error:
   
   ```
   --- FAIL: TestAccAWSELB_InstanceAttaching (177.83 seconds)
     testing.go:121: Step 1 error: Error applying: aws_elb.bar: diffs
   didn't match during apply. This is a bug with the resource provider,
   please report a bug.
   FAIL
   exit status 1
   FAIL  github.com/hashicorp/terraform/builtin/providers/aws  177.882s
   ```
   
   After a quick look I noticed it was actually a bug in core TF so added
   the test and made sure all unit tests and AWS acceptance tests are now
   running successfully.

   Sander van Harmelen committed Dec 12, 2014
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