fix(vispy): handle case where no rotation is required #451
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Otherwise scipy errors with:
```
File ".../pyneuroml/plot/PlotMorphologyVispy.py", line 1714, in create_mesh
rot_obj = Rotation.from_matrix(rot_matrix)
File "_rotation.pyx", line 1136, in scipy.spatial.transform._rotation.Rotation.from_matrix
ValueError: Non-positive determinant (left-handed or null coordinate frame) in rotation matrix 0: [[0. 0. 0.]
[0. 0. 0.]
[0. 0. 0.]].
```
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Otherwise scipy errors with: