Allow the milestones file to be missing.

1 files changed, 6 insertions, 3 deletions

diff --git a/import_issues.py b/import_issues.py
index d301c1d..a9a289d 100755
--- a/import_issues.py
+++ b/import_issues.py
@@ -433,9 +433,12 @@ def run(
     # note.author.name for a subset of relevant users.
 
     milestone_jsons = []
-    with open(export_dir_path / "milestones.ndjson") as milestones_file:
-        for line in milestones_file:
-            milestone_jsons.append(json.loads(line))
+    milestones_file_path = export_dir_path / "milestones.ndjson"
+    # This file may not exist if the project has no milestones.
+    if milestones_file_path.exists():
+        with open(milestones_file_path) as milestones_file:
+            for line in milestones_file:
+                milestone_jsons.append(json.loads(line))
 
     milestone_ids_to_titles = {}
     for milestone_json in milestone_jsons: