fixed issue for broken redirection to template after commment deletion

When you delete a comment , you are not redirected to 'comment/deleted' template instead get following error in browser console-

`Exception from Deps recompute: TypeError: Cannot read property 'post' of undefined
    at Object.Template.comment_page.helpers.post (http://localhost:3000/client/views/comments/comment_page.js?d4b21efd672dd1d21b9818946769287a3e5cf8c2:3:38)
    at apply (http://localhost:3000/packages/handlebars.js?c2b75d49875b4cfcc7544447aad117fd81fccf3b:276:24)
    at invoke (http://localhost:3000/packages/handlebars.js?c2b75d49875b4cfcc7544447aad117fd81fccf3b:293:18)
    at http://localhost:3000/packages/handlebars.js?c2b75d49875b4cfcc7544447aad117fd81fccf3b:385:27
    at Object.Spark.labelBranch (http://localhost:3000/packages/spark.js?3a050592ceb34d6c585c70f1df11e353610be0ab:1171:14)
    at branch (http://localhost:3000/packages/handlebars.js?c2b75d49875b4cfcc7544447aad117fd81fccf3b:355:20)
    at http://localhost:3000/packages/handlebars.js?c2b75d49875b4cfcc7544447aad117fd81fccf3b:384:20
    at Array.forEach (native)
    at Function._.each._.forEach (http://localhost:3000/packages/underscore.js?13ab483e8a3c795d9991577e65e811cd0b827997:130:11)
    at template (http://localhost:3000/packages/handlebars.js?c2b75d49875b4cfcc7544447aad117fd81fccf3b:358:7) `

Now, what i did redirected to original post message with error msg.