Handle empty accounts case explicitly

Address reviewer feedback: explicitly handle the case when no accounts
are logged in. When _users.isEmpty(), we ensure _init is set to false
and _currentUserId remains -1 (no account selected).

Signed-off-by: harshasiddartha <[email protected]>

Author: harshasiddartha

src/gui/tray/usermodel.cpp

@@ -1373,6 +1373,10 @@ void UserModel::buildUserList()
         // Fallback to first account if last selected account not found
         setCurrentUserId(0);
         _init = false;
+    } else if (_init && _users.isEmpty()) {
+        // No accounts available - ensure initialization is complete
+        // _currentUserId remains -1 (no account selected)
+        _init = false;
     }
 }