get_midpoint function does not return None when tree already rooted a…

…t midpoint. Returns first child instead
etetoolkit · Aug 29, 2020 · 7914155 · 7914155
1 parent 6cad2f7
commit 7914155
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/ete3/coretype/tree.py b/ete3/coretype/tree.py
@@ -1158,6 +1158,11 @@ def get_midpoint_outgroup(self):
                 break
             else:
                 current = current.up
+
+        # if we reached the root, the tree is already at midpoint. Return any child as valid outgroup
+        if current is None:
+            current = self.children[0]
+
         return current
 
     def populate(self, size, names_library=None, reuse_names=False,