views: refactor http error handling

Throw ServerError in get(), post(), delete() server methods
in case of connection error or status code with an error.
Log the cause of the error to show it in the web.

Add a function wrapper into every endpoint to handle the
error redirection needed for the ServerError exception.
The wrapper is defined by adding @handle_server_errors('XXX')
on top of the function declaration, where XXX is the name
of the function (endpoint) to be invoked by the redirection.
This change removes the need of specific checks after every
request and cleanups the endpoint code.

Fix the endpoint of the main views to work with an unavailable
ogserver.

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