Fixed failing tests

- Some fixtures added by Erik Ordway broke tests
- message:// links had an edge case I broke with 68701ada
- One test had a hard-coded id that changed

Closes #1019

app/models/todo.rb

@@ -288,7 +288,7 @@ class Todo < ActiveRecord::Base
   end
 
   def notes=(value)
-    super(value.gsub(/</, '&lt;').gsub(/>/, '&gt;'))
+    super(value.try(:gsub, /</, '&lt;').try(:gsub, />/, '&gt;'))
   end
 
   def raw_notes=(value)