Network explorer keeps selection after data is removed #111
Description
The problem manifests like this:
TypeError: object of type 'NoneType' has no len()
(7 additional frame(s) were not displayed)
...
Module "Orange.widgets.gui", in unconditional_commit
do_commit()
Module "Orange.widgets.gui", in do_commit
commit()
Module "Orange.widgets.visualize.utils.widget", in commit
self.send_data()
Module "orangecontrib.network.widgets.OWNxExplorer", in send_data
super().send_data()
Module "Orange.widgets.visualize.utils.widget", in send_data
group_sel = np.zeros(len(data), dtype=int)
The trace comes from sentry, hence no instructions to reproduce.
OWDataProjectionWidget expects that if graph.selection is not None, then self._get_projection_data() doesn't return None. Network explorer apparently violates this.
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