add default value to tests ran when there is no tests

run_tests

@@ -58,6 +58,10 @@
 else
   # Valid with odoo 7, 11, 13
   tests_ran=$(grep -P 'o(penerp|doo).(modules.module|[^ ]+): Ran \K([[:digit:]]+)' $logfile -o | perl -ne '$sum += $_ } { print $sum')
+  if [ -z "$tests_ran" ];
+  then
+      tests_ran=0
+  fi
   tests_failures=$(grep -P 'o(penerp|doo).(modules.module|[^ ]+): Module [a-zA-Z0-9._-]+: \K([[:digit:]]+)' $logfile -o | perl -ne '$sum += $_ } { print $sum')
   # that might be doable in the perl above
   if [ -z "$tests_failures" ];