run_test_suite: make expansion of sql connection strings stable

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@41847 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/bin/run_test_suite

@@ -244,7 +244,7 @@ class ERP5TypeTestSuite(TestSuite):
   def runUnitTest(self, *args, **kw):
     if self.instance:
       args = ('--instance_home=unit_test.%u' % self.instance,) + args
-    mysql_db_list = [string.Template(x).substitute(I=self.instance or '')
+    mysql_db_list = [string.Template(x).substitute(I=self.instance or '1')
                       for x in self.mysql_db_list]
     if len(mysql_db_list) > 1:
       kw['extra_sql_connection_string_list'] = ','.join(mysql_db_list[1:])