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fix _hub_prefix_changed signature
wasn't update for new traitlets API c/o @Milly
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@@ -354,7 +354,8 @@ class JupyterHub(Application):
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return url_path_join(self.base_url, '/hub/')
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@observe('hub_prefix')
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def _hub_prefix_changed(self, name, old, new):
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def _hub_prefix_changed(self, change):
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new = change['new']
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if new == '/':
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raise TraitError("'/' is not a valid hub prefix")
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if not new.startswith(self.base_url):
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