Apply suggestions from code review

Co-authored-by: Jerome Kelleher <jk@well.ox.ac.uk>

Author: kaathewisegit

python/CHANGELOG.rst

@@ -7,7 +7,7 @@ In development
 - Add ``json+struct`` metadata codec that allows storing binary data using a struct
   schema alongside JSON metadata. (:user:`benjeffery`, :pr:`3306`)
 
-- Add `node_labels` parameter to `write_nexus`.
+- Add `node_labels` parameter to `write_nexus`. (:user:`kaathewisegit`, :pr:`3442`)
 
 --------------------
 [1.0.2] - 2026-03-06

python/tskit/text_formats.py

@@ -174,7 +174,7 @@ def write_nexus(
     if include_trees:
         print("BEGIN TREES;", file=out)
 
-        if node_labels:
+        if node_labels is not None:
             translations = ", ".join(f"n{u} {name}" for u, name in node_labels.items())
             print(f"  TRANSLATE {translations};", file=out)