add dummy physics for imu sensor to make gyro work #101
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The gyro needs to be child to a Node with a a Physics element. Otherwise the following warning will pop up:
WARNING: DEF Robot <robotname> (PROTO) > HingeJoint > Solid > HingeJoint > Solid > Solid > Gyro: this node or its parents requires a 'physics' field to be functional.
In URDFs there is often an extra frame for an IMU which is attached by a fixed joint to the actual link the imu is attached to.
This PR adds a dummy physics node to the link holding the imu similar to the dummy physics added so tools don't fall off here:
urdf2webots/urdf2webots/writeProto.py
Line 135 in aa6706a