Clean owner-less calendars support (fixes #254)

radicale/acl/htpasswd.py

@@ -56,7 +56,8 @@ def _sha1(hash_value, password):
 
 def has_right(owner, user, password):
     """Check if ``user``/``password`` couple is valid."""
-    if owner is None: # no owner - everybody is allowed
+    if owner is None and PERSONAL:
+        # No owner and personal calendars, everybody is allowed
         return True
 
     for line in open(FILENAME).readlines():