Fixing issue with detecting which authors/author field to use

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - URL parameter to points.json to allow returning only the JSON for a single
   team by its team id (e.g., points.json?id=abc123).
+### Fixed
+- Handle cases where non-legacy puzzles don't have an `author` attribute
 
 ## [3.4.3] - 2019-11-20
 ### Fixed

devel/moth.py

@@ -384,7 +384,12 @@ class Puzzle:
         self.body.write('</pre>')
 
     def get_authors(self):
-        return self.authors or [self.author]
+        if len(self.authors) > 0:
+            return self.authors
+        elif hasattr(self, "author"):
+            return [self.author]
+        else:
+            return []
 
     def get_body(self):
         return self.body.getvalue()