[regression] It is possible to delete the first page in a project

[Pomax]

STR

• create a new project
• select the only page there is to select
• the "delete" icon is visible, tap it
• you now have a project without pages =x

[Pomax]

git bisect result:

03e9577c8624cbae86993bf683fc91bf3fe24b6f is the first bad commit
commit 03e9577c8624cbae86993bf683fc91bf3fe24b6f
Author: Kate Hudson <k88hudson@gmail.com>
Date:   Thu Jul 23 11:45:42 2015 -0400

    [#386] Restore zoom out button for edit mode

:040000 040000 b14b68b6a9a12e6535262faa89dad9598bc01bf7 ab05b719c965d7c785ba0132abc4d5cd65d38448 M  src

@k88hudson any idea if we lost a check to see if the delete button needed hiding based on pages.length?