remove empty documentation entry

Author: blink1073

jupyter_releaser/changelog.py

@@ -123,6 +123,10 @@ def get_version_entry(
 
     entry = "\n".join(entry).strip()
 
+    # Remove empty documentation entry if only automated changelogs were there
+    if '# Documentation improvements\n\n' in entry:
+        entry = re.sub(r'#+ Documentation improvements\n\n', '')
+
     # Replace "*" unordered list marker with "-" since this is what
     # Prettier uses
     # TODO: remove after github_activity 0.1.4+ is available