[BUGFIX] Enhance getLayerMetadataHtml
[BUGFIX] Enhance getLayerMetadataHtml

linked to #535 base layer - zoom to layer extent

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