Fix parse errors of URDF with metadata

Phylliade / ikpy

An Inverse Kinematics library aiming performance and modularity

http://phylliade.github.io/ikpy

Apache License 2.0

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Closed Phylliade closed 5 years ago

Phylliade commented 5 years ago

Some URDF files have metadata that declare additional links and joints without parents or child: this was causing an error in the parser.

Should fix #36