[FIX]graph view usability bug.
[FIX]Fix the issue of editing inline many2one values doesn't show up  with field name legth
[MERGE]Merged with 7.0
[FIX] display issues of objects with a field called "length"

_.each will interpret these as arrays and take incorrect/nonsensical
code paths.
[IMP] use introduced variable across function
[FIX] display 'undefined' in case of falsy graph value rather than empty label