blog returns 404's if the page does not exist in blog

services/web/app/coffee/Features/Blog/BlogController.coffee

@@ -2,12 +2,13 @@ request = require("request")
 settings = require("settings-sharelatex")
 logger = require("logger-sharelatex")
 _ = require("underscore")
+ErrorController = require "../Errors/ErrorController"
 
 extensionsToProxy = [".png", ".xml", ".jpeg", ".json", ".zip", ".eps"]
 
 module.exports = BlogController = 
 
-	getPage: (req, res)->
+	getPage: (req, res, next)->
 		url = req.url?.toLowerCase()
 		blogUrl = "#{settings.apis.blog.url}#{url}"
 
@@ -19,6 +20,8 @@ module.exports = BlogController =
 
 		logger.log url:url, "proxying request to blog api"
 		request.get blogUrl, (err, r, data)->
+			if r?.statusCode == 404
+				return ErrorController.notFound(req, res, next)
 			data = data.trim()
 			try
 				data = JSON.parse(data)

services/web/test/UnitTests/coffee/Blog/BlogControllerTests.coffee

@@ -1,4 +1,3 @@
-
 should = require('chai').should()
 SandboxedModule = require('sandboxed-module')
 assert = require('assert')
@@ -17,9 +16,11 @@ describe "BlogController", ->
 					url:"http://blog.sharelatex.env"
 		@request = 
 			get: sinon.stub()
+		@ErrorController = {}
 		@BlogController = SandboxedModule.require modulePath, requires:
 			"settings-sharelatex":@settings
 			"logger-sharelatex": log:->
+			"../Errors/ErrorController": @ErrorController
 			"request": @request
 
 		@req = {}
@@ -41,6 +42,17 @@ describe "BlogController", ->
 
 			@BlogController.getPage @req, @res
 
+		it "should send to the error controller if the blog responds 404", (done)->
+			@req.url = "/blog/something.html"
+			@request.get.callsArgWith(1, null, {statusCode:404})
+			
+			@ErrorController.notFound = (req, res)=>
+				assert.deepEqual req, @req
+				assert.deepEqual res, @res
+				done()
+
+			@BlogController.getPage @req, @res
+
 		it "should proxy the image urls", (done)->
 			@BlogController._directProxy = sinon.stub()
 			@req.url = "/something.png"