Add Exceptions for failed API Calls.

[S1MB10T3]

Certain API calls on the site don't have exceptions when a call fails or returns nothing causing pages to be blank and/or crash.

/boards - Page is blank when the API calls fails or returns nothing. Page should return an message stating that the boards are down if the API fails or returns nothing.

/boards/:boardtag - Same issue with the board page. Page should return an message stating that the boards are down if the API fails or if returns nothing, display a message to the user that this board is empty.