Local storage check so as to not error

It seems we don't check this, we just assume it's available.
With the [football world cup we embed a page](http://www.theguardian.com/football/world-cup-2014/overview/embed) that break here and thus doesn't go to run any other JS.

It's a terrible fix, but the only one I can think of for now.

To replicate this bug [go to this article](http://www.theguardian.com/football/ng-interactive/2014/may/23/-sp-world-cup-2014-brazil-results-fixtures-live-scores-tables-schedule) in the app on android.

__CC:__ @sammorrisdesign @adamnfish 

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