Traceback (most recent call last):
  File "/opt/OpsManage/venv3/bin/pyreverse", line 8, in <module>
    sys.exit(run_pyreverse())
  File "/opt/OpsManage/venv3/lib/python3.6/site-packages/pylint/__init__.py", line 37, in run_pyreverse
    PyreverseRun(sys.argv[1:])
  File "/opt/OpsManage/venv3/lib/python3.6/site-packages/pylint/pyreverse/main.py", line 184, in __init__
    sys.exit(self.run(args))
  File "/opt/OpsManage/venv3/lib/python3.6/site-packages/pylint/pyreverse/main.py", line 209, in run
    writer.DotWriter(self.config).write(diadefs)
  File "/opt/OpsManage/venv3/lib/python3.6/site-packages/pylint/pyreverse/writer.py", line 38, in write
    self.write_classes(diagram)
  File "/opt/OpsManage/venv3/lib/python3.6/site-packages/pylint/pyreverse/writer.py", line 59, in write_classes
    self.printer.emit_node(i, **self.get_values(obj))
  File "/opt/OpsManage/venv3/lib/python3.6/site-packages/pylint/pyreverse/writer.py", line 136, in get_values
    args = [arg.name for arg in func.args.args if  arg.name != "self"]
TypeError: 'NoneType' object is not iterable

for func in obj.methods:
                if func.args.args is not None:
                    args = [arg.name for arg in func.args.args if  arg.name != "self"]
                    label = r"%s%s(%s)\l" % (label, func.name, ", ".join(args))
            label = "{%s}" % label