correction Yohan pour generation d'arbre pampa-web

src/taxonomy.py

@@ -142,7 +142,7 @@ class Taxonomy(object):
         if set_of_taxid.issubset(self.descendants[ancestor]):
             return ancestor
         else:
-            return None
+            return ancestor
 
     def unary_ancestor(self, taxid):
         if taxid==None or taxid in  self.root:
@@ -160,7 +160,7 @@ class Taxonomy(object):
     def hca(self, set_of_taxid):
         """ highest common ancestor: highest node whose descendant are set_of_taxid """
         hca=self.lca(set_of_taxid)
-        return unary_ancestor(hca)
+        return self.unary_ancestor(hca)
                
 ## end of class Taxonomy ##