only add non-empty loops. add simple to top on legacy/support path. fix invalid healed report

src/kiri/main.js

@@ -870,7 +870,7 @@ console.log/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
         setTimeout(() => {
             Promise.all(widgets.map(w => w.heal())).then(mod => {
                 API.hide.alert(marker);
-                let healed = mod.map(m => m).length;
+                let healed = mod.filter(m => m).length;
                 if (healed) {
                     API.show.alert(`${healed} Object${healed ? 's':''} healed`);
                 } else {

src/kiri/slice.js

@@ -184,6 +184,7 @@
             // standard legacy polygon
             let top = new Top(poly);
             this.tops.push(top);
+            top.simple = poly;
             return top;
         } else {
             // frop top object passed back by slicePost()

src/kiri/widget.js

@@ -346,6 +346,8 @@ console.log/** Copyright Stewart Allen <sa@grid.space> -- All Rights Reserved */
                 if (data.vertices) {
                     this.loadVertices(data.vertices);
                     this.modified = true;
+                } else {
+                    this.modified = false;
                 }
                 resolve(this.modified);
             });