runner: fix ZeroDivisionError when no test is run

git-svn-id: https://svn.erp5.org/repos/neo/trunk@2699 71dcc9de-d417-0410-9af5-da40c76e7ee4

neo/scripts/runner.py

@@ -184,6 +184,7 @@ class NeoTestRunner(unittest.TestResult):
     def _buildSummary(self, add_status):
         success = self.testsRun - len(self.errors) - len(self.failures)
         add_status('Directory', self.temp_directory)
+        if self.testsRun:
           add_status('Status', '%.3f%%' % (success * 100.0 / self.testsRun))
         for var in os.environ.iterkeys():
             if var.startswith('NEO_TEST'):