[FIX] fixes a crash when the graph view receives an array of values instead of a single value describing a field (addon web_graph)
[FIX] fixes a crash when the graph view receives an array of values instead of a single value describing a field (addon web_graph)

havt/openerp-web,havt/openerp-web,havt/openerp-web,havt/openerp-web,havt/openerp-web