use emitError for template syntax errors

Author: yyx990803

lib/loader.js

@@ -135,7 +135,7 @@ module.exports = function (content) {
     }
   }
 
-  var parts = parse(content, fileName, this.emitWarning)
+  var parts = parse(content, fileName, this.emitError)
   var hasLocalStyles = false
   var output = 'var __vue_script__, __vue_template__\n'
 

lib/selector.js

@@ -6,7 +6,7 @@ module.exports = function (content) {
   this.cacheable()
   var query = loaderUtils.parseQuery(this.query)
   var filename = path.basename(this.resourcePath)
-  var parts = parse(content, filename, this.emitWarning)
+  var parts = parse(content, filename, this.emitError)
   var part = parts[query.type][query.index]
   this.callback(null, part.content, part.map)
 }