Crash in page render

[luisherranz]

Error Cannot read property 'content' of undefined.

Reproducible with these steps:

• Load app in home
• Click on page link in the menu
• Go to home again
• Go to a post
• Swipe right
• Close to go back to home
• Click again on the same page link in the menu you clicked before

[DAreRodz]

Page now uses router's getId() selector to retrieve current page id.