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if (self.searchDisplayController.searchResultsTableView.indexPathForSelectedRow == nil) {
        UIAlertView *alert = [[UIAlertView alloc]
                              initWithTitle: @"Select a User"
                              message: @"Please select a user to send a message to."
                              delegate: nil
                              cancelButtonTitle:@"OK"
                              otherButtonTitles:nil];
        [alert show];
    }
     if(_usersTable.indexPathForSelectedRow == nil) {
        UIAlertView *alert = [[UIAlertView alloc]
                              initWithTitle: @"Select a User"
                              message: @"Please select a user to send a message to."
                              delegate: nil
                              cancelButtonTitle:@"OK"
                              otherButtonTitles:nil];
        [alert show];

    } else {
//DO some stuff
}