Merge "Modify log message to avoid logging null String" into ub-contactsdialer-g-dev

        final Logger logger = getInstance();

        if (logger != null) {

            final QuickContactEvent event = new QuickContactEvent();

            event.referrer = referrer;

            event.referrer = referrer == null ? "Unknown" : referrer;

            event.contactType = contactType;

            event.cardType = cardType;

            event.actionType = actionType;

            event.thirdPartyAction = thirdPartyAction;

            event.thirdPartyAction = thirdPartyAction == null ? "" : thirdPartyAction;

            logger.logQuickContactEventImpl(event);

        }

    }