fixes #370 -- epsilon search would crash when root node in leaf list #400
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implemented discussion with @cmalzer #370 (comment)
fixes example code originally provided by @danielzgtg
epsilon search was working with allow_single_cluster except in the case where eom_clusters contained the root node, which was passed in as a leaf.
Now if using 'eom', 'allow_single_cluster', and 'cluster_selection_epsilon' , the root node is returned as the selected cluster if it is the only cluster in the eom_clusters list.