fix problem with SFC action/transition rename

Traceback (most recent call last):
File "/home/developer/WorkData/PLC/beremiz/beremiz/IDEFrame.py", line
1636, in OnProjectTreeItemEndEdit
elif new_name.upper() in [name.upper() for name in
self.Controler.GetProjectPouVariableNames(pou_name) if name !=
old_name]:
NameError: global name 'pou_name' is not defined

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from pyjs.jsonrpc import JSONRPCServiceBase

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class JSONRPCService(JSONRPCServiceBase):

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    def serve(self):

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        return self.process(request.body.read())

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    def __call__(self,func):

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        self.methods[func.__name__]=func

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        return func

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