[Pkg-samba-maint] Bug#964165: small fix.

[L.P.H. van Belle]

The fix : Temp-fix-is-is-litteral.patch

>From David Disseldorp via samba-technical
 
See https://bugs.python.org/issue34850
  the "is" and "is not" operator sometimes is used with string and
  numerical literals. This code "works" on CPython by accident, because
  of caching on different levels (small integers and strings caches,
  interned strings, deduplicating constants at compile time). But it
  shouldn't work on other implementations, and can not work even on
  early or future CPython versions.
 
It can be ignored, but we should probably fix all such cases in future.
--- a/python/samba/emulate/traffic_packets.py
+++ b/python/samba/emulate/traffic_packets.py
@@ -336,7 +336,7 @@
 
     # try to guess the search expression (don't bother for base searches, as
     # they're only looking up a single object)
-    if (filter is None or filter is '') and scope != SCOPE_BASE:
+    if (filter is None or filter == '') and scope != SCOPE_BASE:
         filter = context.guess_search_filter(attrs, dn_sig, dn)
 
     samdb.search(dn,