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ENH: Throw an exception if getNode does not find a node

Andras Lasso requested to merge github/fork/lassoan/getnode-exception into master

Novice developers were often confused by why their Python code did not work when they have a failed MRML node lookup using getNode function. The problem was that if a node was not found then no errors were reported immediately and the unexpected None value in the variable caused errors later.

Fixed it by throwing a ValueError exception when getNode does not find any nodes.

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