fix read-receipt being sent onFocus on invalid conversation

app/tray_icon.js

@@ -65,7 +65,8 @@ function createTrayIcon(getMainWindow, messages) {
     trayContextMenu = Menu.buildFromTemplate([
       {
         id: 'toggleWindowVisibility',
-        label: messages[mainWindow.isVisible() ? 'appMenuHide' : 'show'].message,
+        label:
+          messages[mainWindow.isVisible() ? 'appMenuHide' : 'show'].message,
         click: tray.toggleWindowVisibility,
       },
       {

js/views/conversation_view.js

@@ -391,7 +391,10 @@
       this.window.addEventListener('resize', this.onResize);
 
       this.onFocus = () => {
-        if (this.$el.css('display') !== 'none') {
+        if (
+          this.$el.css('display') !== 'none' &&
+          this.$el.css('display') !== ''
+        ) {
           this.markRead();
         }
       };