engineScript: use external response callback instead of the one proxied inside sandbox

Author: bjrmatos

lib/render/engineScript.js

@@ -174,7 +174,7 @@ module.exports = function (inputs, callback, done) {
       }
 
       if (typeof templateHelpers !== 'object') {
-        return sandboxContext.respond(new Error('helpers must be string or plain object'))
+        return respondWrap(new Error('helpers must be string or plain object'))
       }
     } else {
       templateHelpers = {}
@@ -190,6 +190,6 @@ module.exports = function (inputs, callback, done) {
       mainSource: originalTemplateHelpersStr
     })
   } catch (e) {
-    sandboxContext.respond(e)
+    respondWrap(e)
   }
 }