Dataviz - fix minor error
Dataviz - fix minor error

jancelin/lizmap-web-client,3liz/lizmap-web-client,rldhont/lizmap-web-client,jancelin/lizmap-web-client,jancelin/lizmap-web-client,rldhont/lizmap-web-client,jancelin/lizmap-web-client,nboisteault/lizmap-web-client,nboisteault/lizmap-web-client,jancelin/lizmap-web-client,nboisteault/lizmap-web-client,3liz/lizmap-web-client,laurentj/lizmap-web-client,laurentj/lizmap-web-client,nboisteault/lizmap-web-client,rldhont/lizmap-web-client,jancelin/lizmap-web-client,rldhont/lizmap-web-client,laurentj/lizmap-web-client,3liz/lizmap-web-client,3liz/lizmap-web-client,laurentj/lizmap-web-client