Only initialize covariances if they are empty
Only initialize covariances if they are empty

Adopted from 3ee92d922308cdfd78e59d8f326383432e46dc4a

starius/pcl,simonleonard/pcl,stefanbuettner/pcl,DaikiMaekawa/pcl,DaikiMaekawa/pcl,shangwuhencc/pcl,KevenRing/pcl,KevenRing/pcl,starius/pcl,lebronzhang/pcl,nikste/pcl,zhangxaochen/pcl,the-glu/pcl,locnx1984/pcl,fskuka/pcl,krips89/pcl_newfeatures,LZRS/pcl,mikhail-matrosov/pcl,chenxingzhe/pcl,Tabjones/pcl,wgapl/pcl,drmateo/pcl,shangwuhencc/pcl,lebronzhang/pcl,MMiknis/pcl,stfuchs/pcl,stfuchs/pcl,mikhail-matrosov/pcl,lebronzhang/pcl,chenxingzhe/pcl,simonleonard/pcl,stefanbuettner/pcl,LZRS/pcl,shangwuhencc/pcl,shyamalschandra/pcl,KevenRing/vlp,the-glu/pcl,cascheberg/pcl,DaikiMaekawa/pcl,wgapl/pcl,wgapl/pcl,chenxingzhe/pcl,fskuka/pcl,damienjadeduff/pcl,the-glu/pcl,KevenRing/vlp,krips89/pcl_newfeatures,shyamalschandra/pcl,MMiknis/pcl,kanster/pcl,kanster/pcl,LZRS/pcl,zhangxaochen/pcl,mikhail-matrosov/pcl,mikhail-matrosov/pcl,MMiknis/pcl,zhangxaochen/pcl,ipa-rmb/pcl,damienjadeduff/pcl,simonleonard/pcl,DaikiMaekawa/pcl,starius/pcl,fskuka/pcl,raydtang/pcl,lebronzhang/pcl,shyamalschandra/pcl,LZRS/pcl,MMiknis/pcl,DaikiMaekawa/pcl,chenxingzhe/pcl,starius/pcl,drmateo/pcl,nikste/pcl,drmateo/pcl,Tabjones/pcl,ipa-rmb/pcl,nikste/pcl,kanster/pcl,mikhail-matrosov/pcl,locnx1984/pcl,zhangxaochen/pcl,krips89/pcl_newfeatures,locnx1984/pcl,nikste/pcl,drmateo/pcl,wgapl/pcl,cascheberg/pcl,chenxingzhe/pcl,raydtang/pcl,locnx1984/pcl,starius/pcl,wgapl/pcl,kanster/pcl,fskuka/pcl,MMiknis/pcl,KevenRing/pcl,locnx1984/pcl,damienjadeduff/pcl,KevenRing/vlp,zhangxaochen/pcl,stfuchs/pcl,kanster/pcl,cascheberg/pcl,drmateo/pcl,stfuchs/pcl,stfuchs/pcl,raydtang/pcl,damienjadeduff/pcl,Tabjones/pcl,simonleonard/pcl,LZRS/pcl,stefanbuettner/pcl,shangwuhencc/pcl,shyamalschandra/pcl,ipa-rmb/pcl,cascheberg/pcl,KevenRing/pcl,stefanbuettner/pcl,the-glu/pcl,fskuka/pcl,KevenRing/vlp,the-glu/pcl,stefanbuettner/pcl,raydtang/pcl,cascheberg/pcl,shangwuhencc/pcl,shyamalschandra/pcl,KevenRing/vlp,ipa-rmb/pcl,raydtang/pcl,nikste/pcl,damienjadeduff/pcl,Tabjones/pcl,KevenRing/pcl,simonleonard/pcl,lebronzhang/pcl,Tabjones/pcl,krips89/pcl_newfeatures,ipa-rmb/pcl,krips89/pcl_newfeatures