fix empty revisions display when restoring a page

test plan:
 * rename a wiki page several times
 * navigate to the revision history for the page
 * restore to a version with a different page name
 - the page should refresh, showing the newly restored name

fixes CNVS-13845

Change-Id: I56df4de17f25393e3d2ce585c777ef3d5a483e51
Reviewed-on: https://gerrit.instructure.com/37470
Reviewed-by: Jeremy Stanley <jeremy@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Clare Strong <clare@instructure.com>
Product-Review: Hilary Scharton <hilary@instructure.com>

app/coffeescripts/bundles/wiki_page_revisions.coffee

@@ -14,6 +14,7 @@ require [
 
   revisionsView = new WikiPageRevisionsView
     collection: revisions
+    pages_path: ENV.WIKI_PAGES_PATH
   revisionsView.on 'selectionChanged', (newSelection) ->
     contentView.setModel(newSelection.model)
     if !newSelection.model.get('title') || newSelection.model.get('title') == ''

app/coffeescripts/views/wiki/WikiPageRevisionView.coffee

@@ -36,5 +36,8 @@ define [
 
     restore: (ev) ->
       ev?.preventDefault()
-      @model.restore().done =>
-        window.location.reload()
+      @model.restore().done (attrs) =>
+        if @pages_path
+          window.location.href = "#{@pages_path}/#{attrs.url}/revisions"
+        else
+          window.location.reload()

app/coffeescripts/views/wiki/WikiPageRevisionsView.coffee

@@ -23,6 +23,8 @@ define [
         'aside': '$aside'
         '.revisions-list': '$revisionsList'
 
+    @optionProperty 'pages_path'
+
     initialize: (options) ->
       super
       @selectedRevision = null
@@ -65,6 +67,7 @@ define [
         @setSelectedModelAndView(model, view)
       selectModel() unless @selectedModel
 
+      view.pages_path = @pages_path
       view.$el.on 'click', selectModel
 
     setSelectedModelAndView: (model, view) ->