Crash in sendTopRecord

[ovejka]

We get numerous crashes because of this code:

- (void)sendTopRecord
{
    // Assemble the full query string by prepending the current baseUrl as last archived.
    NSString *nextAPICall = [[KMAArchiver sharedArchiver] getBaseUrl];
    nextAPICall = [nextAPICall stringByAppendingString:[[KMAArchiver sharedArchiver] getQueryStringAtIndex:0]];
    ...
}

-[KMAArchiver getQueryStringAtIndex:] returns nil in some cases and appending nil-string to nextAPICall crashes.