Fix global object missing signal when disabling Ubuntu Dock

extension.js

@@ -56,6 +56,10 @@ function enable() {
         }
     });
 
+    //create a global object that can emit signals and conveniently expose functionalities to other extensions 
+    global.dashToPanel = {};
+    Signals.addSignalMethods(global.dashToPanel);
+    
     _enable();
 }
 
@@ -78,10 +82,6 @@ function _enable() {
 
     if (panelManager) return; //already initialized
 
-    //create a global object that can emit signals and conveniently expose functionalities to other extensions 
-    global.dashToPanel = {};
-    Signals.addSignalMethods(global.dashToPanel);
-    
     settings = Convenience.getSettings('org.gnome.shell.extensions.dash-to-panel');
     panelManager = new PanelManager.dtpPanelManager(settings);
     panelManager.enable();

panelManager.js

@@ -92,6 +92,7 @@ var dtpPanelManager = Utils.defineClass({
         }
 
         global.dashToPanel.panels = this.allPanels;
+        global.dashToPanel.emit('panels-created');
 
         let panelPosition = Taskbar.getPosition();
         this.allPanels.forEach(p => {
@@ -266,7 +267,6 @@ var dtpPanelManager = Utils.defineClass({
     _reset: function() {
         this.disable(true);
         this.enable(true);
-        global.dashToPanel.emit('panel-reset');
     },
 
     _adjustPanelMenuButton: function(button, monitor, arrowSide) {