[Catalog-sig] Untested patch for PyPI exceptions

[A.M. Kuchling]

The completely untested patch below should remedy the occasional
exceptions that PyPI is occasionally raising.  Can someone provide a
sanity check for this patch?  (I'm not going to deploy it -- not
familiar enough with the setup on the live site.)

--amk

Index: flamenco.py
===================================================================
--- flamenco.py	(revision 452)
+++ flamenco.py	(working copy)
@@ -1,6 +1,7 @@
 #!/usr/bin/python
 
 import sys, pprint, cgi, urllib, os, time, cStringIO
+import psycopg
 
 def flatten(d):
     l = d[1]
@@ -114,7 +115,8 @@
             # overlapping update, just release the lock
             self.store.commit()
             return
-        self.cursor.execute("delete from browse_tally")
+        try:
+            self.cursor.execute("delete from browse_tally")
         # Using PostgreSQL COPY here, instead of a series of INSERT statements
         s = cStringIO.StringIO()
         for _, _, items in self.list_choices()[1]:
@@ -123,6 +125,8 @@
         s.seek(0)
         self.cursor.copy_from(s, 'browse_tally')
         self.cursor.execute("update timestamps set value=now() where name='browse_tally'")
+        except psycopg.ProgrammingError:
+            pass
         self.store.commit()
 
     def get_matches(self, addl_fields=[]):