[easy] restore empty location info in error messages
[easy] restore empty location info in error messages

Summary: to keep the error messages backwards compatible, adds empty location info back to messages that don't have a real location. this is deprecated.

Reviewed By: bhosmer

Differential Revision: D3023261

fb-gh-sync-id: 0c592b420bec42baee7a5761d7d41d6f2278b904
shipit-source-id: 0c592b420bec42baee7a5761d7d41d6f2278b904

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