fix problem happend when tests are running under python-coverage

$ python-coverage run ./tests/tools/test_application.py

Exception while connecting LOCAL://!
Traceback (most recent call last):
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 1753, in _Connect
self._SetConnector(connectors.ConnectorFactory(uri, self)
File "/home/developer/WorkData/PLC/beremiz/beremiz/ProjectController.py", line 1702, in _SetConnector
if connector is not None:
PyAssertionError: C++ assertion "m_window" failed at ../src/gtk/dcclient.cpp(2043) in DoGetSize(): GetSize() doesn't work without window

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from svgui.pyjs.jsonrpc.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