<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def get(name):
    '''Get a linkchecker given its name or fallback on default'''
    linkcheckers = get_enabled(ENTRYPOINT, current_app)
    linkcheckers.update(no_check=NoCheckLinkchecker)  # no_check always enabled
    selected_linkchecker = linkcheckers.get(name)
    if not selected_linkchecker:
        default_linkchecker = current_app.config.get(
                                'LINKCHECKING_DEFAULT_LINKCHECKER')
        selected_linkchecker = linkcheckers.get(default_linkchecker)
    if not selected_linkchecker:
        log.error('No linkchecker found ({} requested and no fallback)'.format(
                  name))
    return selected_linkchecker