Caitlin Potter a93ec73e72 build(broccoli): store DiffResult for re-use only if DiffResult
One of the non-angular broccoli plugins returns a weird object. We can't
assume that all trees meet the contract that we expect them to meet, so
we do a typecheck before storing the result of the rebuild.

Closes #2662
2015-06-29 16:13:02 -07:00
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