Fix missing optional axis element

ros / kdl_parser

kdl_parser and kdl_parser_py provide tools to construct a KDL tree from an XML robot representation in URDF.

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Fix missing optional axis element #84

Open mahaarbo opened 3 months ago

mahaarbo commented 3 months ago

The element is actually optional in URDFs, see http://wiki.ros.org/urdf/XML/joint. This PR sets the axis to the default value (1,0,0) if it is not set in the URDF.