Don't process module.module if module evaluation fails

(Reapply pull request ModuleLoader#188)

Author: johnjbarton

lib/loader.js

@@ -816,14 +816,14 @@ function logloads(loads) {
 
       module.evaluated = true;
       err = doExecute(module);
-      if (err)
+      if (err) {
         module.failed = true;
-      
-      // spec variation
-      // we don't create a new module here because it was created and ammended
-      // we just disable further extensions instead
-      if (Object.preventExtensions)
+      } else if (Object.preventExtensions)
+        // spec variation
+        // we don't create a new module here because it was created and ammended
+        // we just disable further extensions instead
         Object.preventExtensions(module.module);
+      }
 
       module.execute = undefined;
       return err;