Fix migrations for 0.8 -> 0.9 upgrade
Fix migrations for 0.8 -> 0.9 upgrade

viewflow/viewflow,viewflow/viewflow,codingjoe/viewflow,ribeiro-ucl/viewflow,codingjoe/viewflow,pombredanne/viewflow,ribeiro-ucl/viewflow,pombredanne/viewflow,codingjoe/viewflow,viewflow/viewflow,ribeiro-ucl/viewflow