dep init crashes

[bgaifullin]

dep init crashes with the following stack trace

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x50 pc=0x133ed2c]

goroutine 53 [running]:
github.com/golang/dep/vendor/github.com/sdboyer/gps.(*SourceMgr).SyncSourceFor(0xc4200849c0, 0xc420558000, 0x19, 0x0, 0x0, 0x0, 0x0)
/go/src/github.com/golang/dep/vendor/github.com/sdboyer/gps/source_manager.go:461 +0x10c
main.getProjectData.func1(0xc420558000, 0x19, 0xc4200849c0)
/go/src/github.com/golang/dep/cmd/dep/init.go:226 +0x6c
created by main.getProjectData
/go/src/github.com/golang/dep/cmd/dep/init.go:251 +0xab5

[sdboyer]

Thanks for the report! Sorry you ran into that. It's fixed upstream, we just haven't integrated latest gps in a while. (See e.g. #250)