allow empty template (close vuejs#3212)

yyx990803 · yyx990803 · commit 163994c6eb10 · 2016-07-02T15:00:24.000-04:00
diff --git a/src/compiler/transclude.js b/src/compiler/transclude.js
@@ -74,6 +74,9 @@ function transcludeTemplate (el, options) {
   var frag = parseTemplate(template, true)
   if (frag) {
     var replacer = frag.firstChild
+    if (!replacer) {
+      return frag
+    }
     var tag = replacer.tagName && replacer.tagName.toLowerCase()
     if (options.replace) {
       /* istanbul ignore if */
