Component stack fixes

app/assets/javascripts/ui_models/component_group.ts

@@ -14,7 +14,6 @@ export class ComponentGroup {
   private application: WebApplication
   changeObservers: any[] = []
   activeComponents: UuidString[] = []
-  
 
   constructor(application: WebApplication) {
     this.application = application;
@@ -86,6 +85,7 @@ export class ComponentGroup {
    */
   public addChangeObserver(callback: () => void) {
     this.changeObservers.push(callback);
+    callback();
     return () => {
       removeFromArray(this.changeObservers, callback);
     }

app/assets/javascripts/ui_models/editor.ts

@@ -38,7 +38,7 @@ export class Editor {
     if (matchingNote) {
       this.isTemplateNote = false;
       this.note = matchingNote;
-      this._onNoteValueChange!(matchingNote, source);
+      this._onNoteValueChange && this._onNoteValueChange!(matchingNote, source);
     }
   }