fix run-tests.php failure when no custom php.ini passed

diff --git a/run-tests.php b/run-tests.php
index 87b8daaffa9c5b6a9b7d5764e1b9384f7ad076bd..34b115554a0854e2e2ac8b9792a25490e3888d80 100755 (executable)
--- a/run-tests.php
+++ b/run-tests.php
@@ -544,10 +544,12 @@ HELP;
                }
        }
 
-       if (substr(PHP_OS, 0, 3) != "WIN") {
-               $pass_options .= " -c " . escapeshellarg($conf_passed);
-       } else {
-               $pass_options .= " -c '$conf_passed'";
+       if (strlen($conf_passed)) {
+               if (substr(PHP_OS, 0, 3) != "WIN") {
+                       $pass_options .= " -c " . escapeshellarg($conf_passed);
+               } else {
+                       $pass_options .= " -c '$conf_passed'";
+               }
        }
 
        $test_files = array_unique($test_files);