Return an empty config if nil
Return an empty config if nil

Since the Config is a read-only entity, Confg() method returned a value
instead of the pointer. In cases the config is nil, we should return an
empty config.

Signed-off-by: Madhu Venugopal <d22477479bbf55ba62bd822f4112c80f292c7805@docker.com>

pyakpyak/libnetwork,msagheer/libnetwork,hackersdotmu/libnetwork,abhi/libnetwork,dcbw/libnetwork,abronan/libnetwork,frntn/libnetwork,djones-skytap/libnetwork,anshulr/libnetwork,msabansal/libnetwork,brewertribe/libnetwork,lindenlab/libnetwork,jimmycmh/libnetwork,wcwxyz/libnetwork,anortef/libnetwork,cloudflare/libnetwork,jvinod/libnetwork,YujiOshima/libnetwork,hw-qiaolei/libnetwork,tgraf/libnetwork,junxu/libnetwork,axsh/libnetwork,tangkun75/libnetwork,amitkris/libnetwork,vdemeester/libnetwork,kunalkushwaha/libnetwork,ityangchen/libnetwork,curtiszimmerman/libnetwork,vijayendrabvs/libnetwork,wulonghui/libnetwork,docker/libnetwork,vdemeester/libnetwork,argvader/libnetwork,msabansal/libnetwork,frntn/libnetwork,wulonghui/libnetwork,tangkun75/libnetwork,tmakita/libnetwork,docker/libnetwork,medallia/libnetwork,brahmaroutu/libnetwork,anortef/libnetwork,jvinod/libnetwork,mountkin/libnetwork,rogaha/libnetwork,ityangchen/libnetwork,mapuri/libnetwork,sainath14/libnetwork,hw-qiaolei/libnetwork,fcrisciani/libnetwork,mYmNeo/libnetwork,allencloud/libnetwork,bprashanth/libnetwork,mahak/libnetwork,aboch/libnetwork_new,sanimej/libnetwork,thockin/libnetwork,coolljt0725/libnetwork,wcwxyz/libnetwork,cpuguy83/libnetwork,lindenlab/libnetwork,AdoHe/libnetwork,abhi/libnetwork,vijayendrabvs/libnetwork,tgraf/libnetwork,dcbw/libnetwork,kvasdopil/libnetwork,anarcher/libnetwork,medallia/libnetwork,mountkin/libnetwork,tmakita/libnetwork,kolyshkin/libnetwork,mahak/libnetwork,curtiszimmerman/libnetwork,axsh/libnetwork,anarcher/libnetwork,calavera/libnetwork,kvasdopil/libnetwork,allencloud/libnetwork,abhi/libnetwork,hackersdotmu/libnetwork,calavera/libnetwork,mbanikazemi/libnetwork,brewertribe/libnetwork,coolljt0725/libnetwork,brahmaroutu/libnetwork,mavenugo/libnetwork,argvader/libnetwork,jmzwcn/libnetwork,runcom/libnetwork,carlye566/libnetwork,carlye566/libnetwork,mYmNeo/libnetwork,minhoryang/libnetwork,djones-skytap/libnetwork,AdoHe/libnetwork,vdemeester/libnetwork,sainath14/libnetwork,bprashanth/libnetwork,anshulr/libnetwork,abronan/libnetwork,thockin/libnetwork,docker/libnetwork,clnperez/libnetwork,msagheer/libnetwork,kunalkushwaha/libnetwork,minhoryang/libnetwork,carlye566/libnetwork_eric,ycaihua/libnetwork,ycaihua/libnetwork,mapuri/libnetwork,pyakpyak/libnetwork,fcrisciani/libnetwork,WeiZhang555/libnetwork,aboch/libnetwork_new,YujiOshima/libnetwork,mavenugo/libnetwork,sanimej/libnetwork,cpuguy83/libnetwork,jmzwcn/libnetwork,WeiZhang555/libnetwork,jimmycmh/libnetwork,kolyshkin/libnetwork,medallia/libnetwork,amitkris/libnetwork,kolyshkin/libnetwork,cloudflare/libnetwork,runcom/libnetwork,sharmasushant/libnetwork,carlye566/libnetwork_eric,junxu/libnetwork,chenchun/libnetwork,clnperez/libnetwork,chenchun/libnetwork,sharmasushant/libnetwork,rogaha/libnetwork,mbanikazemi/libnetwork,mahak/libnetwork