fix release_notes script

scripts/release_notes.py

@@ -5,7 +5,7 @@
 """
 
 import os
-from typing import List
+from typing import List, Optional
 
 import packaging.version
 
@@ -46,13 +46,15 @@ def get_change_log_notes() -> str:
 def get_commit_history() -> str:
     new_version = packaging.version.parse(TAG)
 
+    os.popen("git fetch --tags")
+
     # Get all tags sorted by version, latest first.
     all_tags = os.popen("git tag -l --sort=-version:refname 'v*'").read().split("\n")
 
     # Out of `all_tags`, find the latest previous version so that we can collect all
     # commits between that version and the new version we're about to publish.
     # Note that we ignore pre-releases unless the new version is also a pre-release.
-    last_tag: str
+    last_tag: Optional[str] = None
     for tag in all_tags:
         if not tag.strip():  # could be blank line
             continue
@@ -62,7 +64,10 @@ def get_commit_history() -> str:
         if version < new_version:
             last_tag = tag
             break
-    commits = os.popen(f"git log {last_tag}..{TAG}^ --oneline --first-parent").read()
+    if last_tag is not None:
+        commits = os.popen(f"git log {last_tag}..{TAG}^ --oneline --first-parent").read()
+    else:
+        commits = os.popen(f"git log --oneline --first-parent").read()
     return "## Commits\n\n" + commits