Allow unnamed-package classes in ProguardMap
Allow unnamed-package classes in ProguardMap

Summary:
Extend filename guessing to classes in the unnamed package.

Github issue https://github.com/facebook/redex/issues/449

Reviewed By: thezhangwei

Differential Revision: D19294526

fbshipit-source-id: 38e42cd04b789f6112be2b93b229efed14097495

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex