Updated filter.jade in views/modelIndex to access model.grid.activeFilters[fieldName] only when filedName is defined to avoid can not read undefined of undefined error in some cases.
Updated filter.jade in views/modelIndex to access model.grid.activeFilters[fieldName] only when filedName is defined to avoid can not read undefined of undefined error in some cases.

linzjs/linz,linzjs/linz,linzjs/linz