Fix according to Rasa OSS PR #11529

changelog/_template.md.jinja2

@@ -5,6 +5,8 @@
 {% if definitions[category]['showcontent'] %}{% for text, values in sections[section][category]|dictsort(by='value') %}{% set issue_joiner = joiner(', ') %}- {% for value in values|sort %}{{ issue_joiner() }}{{ value }}{% endfor %}: {{ text }}
 {% endfor %}{% else %}- {{ sections[section][category]['']|sort|join(', ') }}{% endif %}{% if sections[section][category]|length == 0 %} No significant changes.
 
-{% else %}{% endif %}{% endfor %}{% else %} No significant changes.
+{% else %}{% endif %}{% endfor %}{% else %} 
+
+No significant changes.
 
 {% endif %}{% endfor %}

scripts/publish_gh_release_notes.py

@@ -57,11 +57,11 @@ def parse_changelog(tag_name: Text) -> Text:
         if consuming_version:
             version_lines.append(line)
 
-    # return default value as github release body
-    if not version_lines:
-        return "No significant changes."
-    # drop the first lines (version headline, not needed for GH)
-    return "\n".join(version_lines[2:]).strip()
+    if consuming_version:
+        # drop the first lines (version headline, not needed for GH)
+        return "\n".join(version_lines[2:]).strip()
+    else:
+        return None
 
 
 def main():
@@ -86,7 +86,7 @@ def main():
     else:
         md_body = parse_changelog(tag_name)
 
-    if not md_body:
+    if md_body is None:
         print("Failed to extract changelog entries for version from changelog.")
         return 2