fix delete face selection

src/main/mesh.js

@@ -311,7 +311,7 @@ function space_init(data) {
                     if ([api.modes.object, api.modes.tool, api.modes.sketch].contains(mode)) {
                         selection.delete();
                     } else {
-                        for (let m of selection.models()) {
+                        for (let m of api.model.list()) {
                             m.deleteSelections();
                             space.refresh()
                         }

src/mesh/model.js

@@ -697,6 +697,9 @@ mesh.model = class MeshModel extends mesh.object {
     }
 
     deleteSelections(append) {
+        if (!this.sel.faces.length) {
+            return;
+        }
         let newverts = this.collectFacesByMaterialIndex(0);
         if (newverts) {
             if (append) {