Relation.baseAsset getter: More friendly error message if the base asset cannot be found.
Relation.baseAsset getter: More friendly error message if the base asset cannot be found.

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