Handle "unsupported argument" case for CDB_UserTables

in support of #64

README.md

@@ -11,7 +11,7 @@ See https://github.com/CartoDB/cartodb/wiki/CartoDB-PostgreSQL-extension
 Dependencies
 ------------
 
- * PostgreSQL 9.3+ (with plpythonu extension)
+ * PostgreSQL 9.3+ (with plpythonu extension and xml support)
  * [PostGIS extension](http://postgis.net) 
  * [Schema triggers extension]
    (https://bitbucket.org/malloclabs/pg_schema_triggers)

scripts-available/CDB_UserTables.sql

@@ -20,7 +20,8 @@ AND n.nspname NOT IN ('pg_catalog', 'information_schema')
 AND CASE WHEN perm = 'public' THEN has_table_privilege('public', c.oid, 'SELECT')
          WHEN perm = 'private' THEN has_table_privilege(c.oid, 'SELECT') AND NOT 
                                     has_table_privilege('public', c.oid, 'SELECT')
-         ELSE has_table_privilege(c.oid, 'SELECT') END;
+         WHEN perm = 'all' THEN has_table_privilege(c.oid, 'SELECT') 
+         ELSE false END;
 
 $$ LANGUAGE 'sql';