Fix datetime compare error

inventory-app/doorboy.py

@@ -1,5 +1,5 @@
 from datetime import datetime, timedelta
-from dateutil.parser import parse
+from dateutil.parser import parse, ParserError
 
 from bson.objectid import ObjectId
 from flask import Blueprint, g, redirect, render_template, request
@@ -221,9 +221,23 @@ def view_doorboy_admin():
 
     orphaned_keyfobs = sorted(orphaned_keyfobs, key = lambda o : (not bool(o.get("comment")), o.get("comment", "")))
     no_keyfobs = sorted(no_keyfobs, key = lambda u : u.display_name or u.username)
-    last_seen = dict(sorted(last_seen.items(), key = lambda item: item[1] or datetime.min, reverse=True))
+    last_seen = dict(sorted(last_seen.items(), key=lambda i : datetime_handle(i[1]), reverse=True))
     return render_template("doorboy_admin.html", **locals())
 
+def datetime_handle(item):
+    if not item:
+        return datetime.min
+    elif type(item) is str:
+        try:
+            return parse(item)
+        except ParserError as e:
+            print(e)
+            return datetime.min
+    elif type(item) is datetime:
+        return item
+    else:
+        return datetime.min
+
 @page_doorboy.route("/m/doorboy/swipes")
 @login_required
 def view_doorboy_events():