fix uncaught exception when deleting battle for sector update

src/warchron/controller/app_controller.py

@@ -282,7 +282,15 @@ class AppController:
                 QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No,
             )
             if reply == QMessageBox.StandardButton.Yes:
-                e.action()
+                try:
+                    e.action()
+                except DomainError as inner:
+                    QMessageBox.warning(
+                        self.view,
+                        "Update forbidden",
+                        str(inner),
+                    )
+                    return
             else:
                 return
         self.is_dirty = True