Merge pull request #7368 from mheiman/7355/bugfix/edition_author_diff

Correctly handle author data in edition diff display

openlibrary/templates/diff.html

@@ -113,7 +113,7 @@ <h2 class="collapse"><a href="$a.key">$title</a> &rarr; Diff</h2>
                     return thingdiff("/type/text", "table_of_contents", a.get_toc_text(), b.get_toc_text())
                 elif p == "title_prefix":
                     return thingdiff("/type/string", "title_prefix", a[p].strip(), b[p].strip())
-                elif p == "authors":
+                elif p == "authors" and a.type.key == "/type/work":
                     label = "authors"
                     t = "/type/author"
                     ap = [val.author for val in a.authors]