dump: check existence before include data subdirs (#4100)
dump: check existence before include data subdirs (#4100)

wangjild/gogs,xaionaro/gogs,dancewing/gogs,cgars/gogs,chriswatt/gogs,pikacloud/pikacode,dlob/gogs,gogits/gogs,linquize/gogs,chriswatt/gogs,cgars/gogs,dlob/gogs,ForxaCoLab/forxa,linquize/gogs,pikacloud/pikacode,gogits/gogs,dancewing/gogs,dancewing/gogs,xaionaro/gogs,Spice-King/gogs,mukaiu/gogs,mukaiu/gogs,dancewing/gogs,liliexuan/gogs,ForxaCoLab/forxa,linquize/gogs,liliexuan/gogs,chriswatt/gogs,Spice-King/gogs,pikacloud/pikacode,gogits/gogs,psaavedra/gogs,wangjild/gogs,dlob/gogs,wangjild/gogs,cgars/gogs,psaavedra/gogs,liliexuan/gogs,psaavedra/gogs,ForxaCoLab/forxa,xaionaro/gogs,mukaiu/gogs,Spice-King/gogs