Avoid TypeError due to NoneType comparison #30
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In python3, comparing None with other types is no longer possible. This leads to a TypeError in https://github.com/ros-visualization/rqt_reconfigure/blob/master/src/rqt_reconfigure/param_updater.py#L70. The python2 behavior can be reproduced by changing the line as suggested in this PR.