fix: check for edge-case #102
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Running with the debug version:
would trigger an assertion error, that would detect an empty node when it should not be present.
This was caused by the fact that the detection of empty nodes was based on checking whether the node start and end are at the same position. However there is an edge-case: circular paths made of a single node can have coinciding start and end, and be non-empty. This is now checked properly in the assertion.