stream.pipe: Don't call destroy() unless it's a function

lib/stream.js

@@ -71,7 +71,7 @@ Stream.prototype.pipe = function(dest, options) {
     if (didOnEnd) return;
     didOnEnd = true;
 
-    dest.destroy();
+    if (typeof dest.destroy === 'function') dest.destroy();
   }
 
   // don't leave dangling pipes when there are errors.