When the node executes data requests, HTTP errors are not logged

[tmpolaczyk]

PR #1277 we introduce a log line to handle failed RADON retrievals:

                 Err(e) => log::debug!("Failed result for source {}: {:?}", retrieve.url, e), 

But that line is never entered when the error e is an HTTP error, which seems to be the most common type of error in the current testnet. To fix that we need to handle early returns caused by the ? operator, the simple solution is to wrap the entire funcion and move the log outside that wrapper:

fn foo() {
    let foo_wrapped = || { /* code here */ };
    match foo_wrapped() { /* logs here */ }
}