SP-1816 Crash archiving IMDI (#732)
SP-1816 Crash archiving IMDI (#732)

check for empty path before combining.
(Approved May 18 & 23 on a different pull request but never merged)
sillsdev/libpalaso,gtryus/libpalaso,gtryus/libpalaso,gtryus/libpalaso,gmartin7/libpalaso,gmartin7/libpalaso,sillsdev/libpalaso,ermshiperete/libpalaso,sillsdev/libpalaso,ermshiperete/libpalaso,ermshiperete/libpalaso,ermshiperete/libpalaso,gmartin7/libpalaso,gtryus/libpalaso,gmartin7/libpalaso,sillsdev/libpalaso