[FIX] web: fix kanban view grouped on unset m2o

The previous code loading the tooltip data was sending a null value
to read as id, which resulted in an access error. This behavior was
not observable in the tests because of b8c1571 which was meant to
allow giving inexistant ids to mockRead but also ended up accepting
falsy values, which was not true to the actual server.

In addition, the title of the column was wrong for unset m2o, it
displayed false, the value of the field when unset, rather than
the default "Undefined" title.

0 files changed, 0 insertions, 0 deletions