Bug 730438 - camel_movemail: Treat no source file as no mail to copy
Bug 730438 - camel_movemail: Treat no source file as no mail to copy

Previously -1 would be returned if the file did not exist, which
I think was incorrect - according to a comment in the file,
missing mail files should be considered as empty, and the function
returns 0 (success) in that case. It has now been changed to also return
0 if the source file doesn't exist.

matzipan/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server