change to .text() extraction of template, fix SafeWaiter error handling

lms/static/coffee/src/instructor_dashboard/analytics.coffee

@@ -14,7 +14,7 @@ class ProfileDistributionWidget
       title: @title
       feature: @feature
       endpoint: @endpoint
-    template_html = $("#profile-distribution-widget-template").html()
+    template_html = $("#profile-distribution-widget-template").text()
     @$container.html Mustache.render template_html, template_params
 
   reset_display: ->
@@ -93,7 +93,7 @@ class ProfileDistributionWidget
 class GradeDistributionDisplay
   constructor: ({@$container, @endpoint}) ->
     template_params = {}
-    template_html = $('#grade-distributions-widget-template').html()
+    template_html = $('#grade-distributions-widget-template').text()
     @$container.html Mustache.render template_html, template_params
     @$problem_selector = @$container.find '.problem-selector'
 

lms/static/coffee/src/instructor_dashboard/instructor_dashboard.coffee

@@ -61,10 +61,8 @@ class SafeWaiter
     =>
       @waitFor_handlers = @waitFor_handlers.filter (g) -> g isnt f
       if @waitFor_handlers.length is 0
-        plantTimeout 0, =>
-          @fired = true
-          for cb in @after_handlers
-            cb()
+        @fired = true
+        @after_handlers.map (cb) -> plantTimeout 0, cb
 
       f.apply this, arguments