Fixing the issue of the fail attribute not existing in _end_test #80
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When RobotEyes is included in the RobotFramework and it isn't used, the open_eyes method is never called.
If another task triggers a failure, Robot Eyes improperly handles the error. The self.fail attribute is set in open_eyes, but it needs to be set in either init or as a global variable for RobotEyes when it's invoked.
[ ERROR ] Calling method '_end_test' of listener 'RobotEyes' failed: AttributeError: 'RobotEyes' object has no attribute 'fail'
I set it as a global variable for the class. So when open_eyes is triggered it will set the value for fail. I set the default value to False. This should remove the error that's encountered when other libraries have failed and RobotEyes has been included in the test suite, but open_eyes hasn't been invoked.