fix: Add newline to end of cisco output when removing duplicates.

PiperOrigin-RevId: 750279566

Author: Capirca Team

capirca/lib/cisco.py

@@ -1408,5 +1408,5 @@ def __str__(self):
       if not configure_replace_compatible:
         target += ['', 'exit', '']
     if self.remove_duplicate_network_objectgroups:
-      return self._remove_duplicate_objects('\n'.join(target))
+      return self._remove_duplicate_objects('\n'.join(target)) + '\n'
     return '\n'.join(target)