fix test runner stopping on metrics test

package.json

@@ -106,6 +106,7 @@
         "c9.ide.run.build": "#ad45874c88",
         "c9.ide.run.debug.xdebug": "#3b1520f83d",
         "c9.ide.save": "#58b8616a88",
+        "c9.ide.scm": "#undefined",
         "c9.ide.terminal.monitor": "#b0b4d03280",
         "c9.ide.theme.flat": "#2de8414db7",
         "c9.ide.threewaymerge": "#229382aa0b",

plugins/c9.vfs.standalone/www/test.html

@@ -226,8 +226,10 @@
                 running = false;
                 lastDone && lastDone();
             }
-            running ? done() : mocha.run(done);
-            running = true;
+            if (!running) {
+                running = true;
+                mocha.run(done);
+            }
         };
         onload.remain = onload.remain == "1";