CacheManifest: Fixed parsing of existing cache manifest.
CacheManifest: Fixed parsing of existing cache manifest.

This was actually covered by a test, but the accidentally global var 'AssetGraph' that was fixed in 438c2990 prevented the test from failing. What are the odds?

slang800/assetgraph,slang800/assetgraph,papandreou/assetgraph,assetgraph/assetgraph,jscinoz/assetgraph,jscinoz/assetgraph,jscinoz/assetgraph,papandreou/assetgraph,papandreou/assetgraph