Properly handle autosave local storage exceptions.

CHANGELOG

@@ -20,6 +20,7 @@ v 7.9.0 (unreleased)
   - Add brakeman (security scanner for Ruby on Rails)
   - Slack username and channel options
   - Add grouped milestones from all projects to dashboard.
+  - Properly handle autosave local storage exceptions.
 
 v 7.8.1
   - Fix run of custom post receive hooks

app/assets/javascripts/autosave.js.coffee

@@ -14,7 +14,11 @@ class @Autosave
   restore: ->
     return unless window.localStorage?
 
+    try
       text = window.localStorage.getItem @key
+    catch
+      return
+
     @field.val text if text?.length > 0
     @field.trigger "input"    
 
@@ -23,6 +27,7 @@ class @Autosave
 
     text = @field.val()
     if text?.length > 0
+      try
         window.localStorage.setItem @key, text
     else
       @reset()
@@ -30,4 +35,5 @@ class @Autosave
   reset: ->
     return unless window.localStorage?
 
+    try 
       window.localStorage.removeItem @key