add geom type none to feature type creation

src/views/FeatureType/FeatureTypeEdit.vue

@@ -170,6 +170,7 @@ export default {
         { value: 'linestring', name: 'Ligne' },
         { value: 'point', name: 'Point' },
         { value: 'polygon', name: 'Polygone' },
+        { value: 'none', name: 'Aucune' },
       ],
       form: {
         colors_style: {