Fix for error when attempting to save static_placeholder on non-cms pages

Before this fix user receives:
AttributeError: 'NoneType' object has no attribute 'get_title'

When attempting to "Publish Changes" on a non-CMS page with static placeholders.

Signed-off-by: Martin Koistinen <mkoistinen@gmail.com>
Merge pull request #2601 from mkoistinen/statics_outside_of_cms

Fix for Publish Changes on non-cms pages containing static_placeholders