Fixed a bug in tf.py where a call to Quat.vector() would throw an error instead of returning the imaginary vector portion of a quaternion.
Fixed a bug in tf.py where a call to Quat.vector() would throw an error instead of returning the imaginary vector portion of a quaternion.

ndantam/amino,ndantam/amino,golems/amino,ndantam/amino,golems/amino,golems/amino,ndantam/amino,ndantam/amino,golems/amino,ndantam/amino,golems/amino,golems/amino