Fix possible null reference exception in LdmlDataMapper
Fix possible null reference exception in LdmlDataMapper

gtryus/libpalaso,gmartin7/libpalaso,andrew-polk/libpalaso,andrew-polk/libpalaso,ddaspit/libpalaso,sillsdev/libpalaso,ermshiperete/libpalaso,sillsdev/libpalaso,mccarthyrb/libpalaso,gtryus/libpalaso,glasseyes/libpalaso,tombogle/libpalaso,ermshiperete/libpalaso,gmartin7/libpalaso,gmartin7/libpalaso,gtryus/libpalaso,gtryus/libpalaso,glasseyes/libpalaso,glasseyes/libpalaso,tombogle/libpalaso,gmartin7/libpalaso,ddaspit/libpalaso,tombogle/libpalaso,mccarthyrb/libpalaso,mccarthyrb/libpalaso,ddaspit/libpalaso,glasseyes/libpalaso,sillsdev/libpalaso,mccarthyrb/libpalaso,tombogle/libpalaso,sillsdev/libpalaso,andrew-polk/libpalaso,ermshiperete/libpalaso,ddaspit/libpalaso,andrew-polk/libpalaso,ermshiperete/libpalaso