Use is not None

Author: takaoka-k-wap

sudachipy/plugin/path_rewrite/path_rewrite_plugin.py

@@ -64,7 +64,7 @@ def concatenate_oov(self, path, begin, end, pos_id, lattice):
         e = path[end - 1].get_end()
 
         n = lattice.get_minimum_node(b, e)
-        if n:
+        if n is not None:
             path[begin:end] = [n]
             return n