Fix UpdateDomFromDataSet
Fix UpdateDomFromDataSet

Catch null object introduced by fix for
originalContributions (BL-4556)
StephenMcConnel/BloomDesktop,andrew-polk/BloomDesktop,StephenMcConnel/BloomDesktop,andrew-polk/BloomDesktop,JohnThomson/BloomDesktop,BloomBooks/BloomDesktop,StephenMcConnel/BloomDesktop,andrew-polk/BloomDesktop,gmartin7/myBloomFork,JohnThomson/BloomDesktop,JohnThomson/BloomDesktop,andrew-polk/BloomDesktop,gmartin7/myBloomFork,StephenMcConnel/BloomDesktop,JohnThomson/BloomDesktop,StephenMcConnel/BloomDesktop,JohnThomson/BloomDesktop,BloomBooks/BloomDesktop,StephenMcConnel/BloomDesktop,BloomBooks/BloomDesktop,BloomBooks/BloomDesktop,gmartin7/myBloomFork,gmartin7/myBloomFork,gmartin7/myBloomFork,BloomBooks/BloomDesktop,gmartin7/myBloomFork,andrew-polk/BloomDesktop,BloomBooks/BloomDesktop,andrew-polk/BloomDesktop