Handle a null-list error case.
Handle a null-list error case.

williampma/atomspace,misgeatgit/atomspace,ArvinPan/atomspace,sanuj/opencog,UIKit0/atomspace,AmeBel/opencog,inflector/opencog,printedheart/atomspace,ceefour/opencog,cosmoharrigan/opencog,TheNameIsNigel/opencog,ceefour/opencog,rodsol/opencog,kinoc/opencog,ArvinPan/atomspace,Allend575/opencog,jswiergo/atomspace,iAMr00t/opencog,Selameab/atomspace,yantrabuddhi/opencog,ceefour/opencog,andre-senna/opencog,Selameab/opencog,rohit12/opencog,cosmoharrigan/atomspace,Allend575/opencog,misgeatgit/opencog,TheNameIsNigel/opencog,prateeksaxena2809/opencog,roselleebarle04/opencog,gaapt/opencog,cosmoharrigan/opencog,inflector/opencog,printedheart/atomspace,kim135797531/opencog,anitzkin/opencog,sanuj/opencog,cosmoharrigan/opencog,yantrabuddhi/opencog,williampma/opencog,virneo/opencog,eddiemonroe/atomspace,gavrieltal/opencog,sumitsourabh/opencog,TheNameIsNigel/opencog,Tiggels/opencog,Selameab/atomspace,prateeksaxena2809/opencog,inflector/atomspace,sanuj/opencog,virneo/atomspace,rodsol/atomspace,eddiemonroe/opencog,williampma/opencog,cosmoharrigan/opencog,printedheart/atomspace,virneo/atomspace,sanuj/opencog,ruiting/opencog,yantrabuddhi/opencog,eddiemonroe/atomspace,rodsol/opencog,cosmoharrigan/atomspace,rohit12/opencog,Allend575/opencog,MarcosPividori/atomspace,rodsol/atomspace,printedheart/opencog,jlegendary/opencog,rodsol/opencog,gaapt/opencog,kinoc/opencog,printedheart/opencog,yantrabuddhi/atomspace,sumitsourabh/opencog,yantrabuddhi/opencog,virneo/opencog,virneo/atomspace,Allend575/opencog,AmeBel/opencog,yantrabuddhi/atomspace,inflector/atomspace,virneo/atomspace,zhaozengguang/opencog,inflector/opencog,ArvinPan/opencog,kim135797531/opencog,rTreutlein/atomspace,andre-senna/opencog,cosmoharrigan/opencog,Allend575/opencog,prateeksaxena2809/opencog,misgeatgit/opencog,iAMr00t/opencog,Tiggels/opencog,jlegendary/opencog,andre-senna/opencog,Allend575/opencog,TheNameIsNigel/opencog,tim777z/opencog,sumitsourabh/opencog,rohit12/atomspace,misgeatgit/opencog,zhaozengguang/opencog,printedheart/opencog,iAMr00t/opencog,shujingke/opencog,sumitsourabh/opencog,rohit12/opencog,zhaozengguang/opencog,rodsol/opencog,sanuj/opencog,AmeBel/opencog,prateeksaxena2809/opencog,printedheart/opencog,ceefour/atomspace,iAMr00t/opencog,andre-senna/opencog,anitzkin/opencog,MarcosPividori/atomspace,AmeBel/atomspace,rTreutlein/atomspace,shujingke/opencog,ceefour/atomspace,MarcosPividori/atomspace,yantrabuddhi/atomspace,misgeatgit/opencog,anitzkin/opencog,shujingke/opencog,virneo/opencog,kinoc/opencog,iAMr00t/opencog,roselleebarle04/opencog,jlegendary/opencog,rohit12/opencog,eddiemonroe/opencog,kim135797531/opencog,tim777z/opencog,ArvinPan/atomspace,jswiergo/atomspace,gavrieltal/opencog,jlegendary/opencog,virneo/opencog,rohit12/opencog,gavrieltal/opencog,roselleebarle04/opencog,eddiemonroe/atomspace,williampma/atomspace,andre-senna/opencog,jlegendary/opencog,ruiting/opencog,anitzkin/opencog,Tiggels/opencog,gaapt/opencog,AmeBel/opencog,kim135797531/opencog,tim777z/opencog,TheNameIsNigel/opencog,Tiggels/opencog,andre-senna/opencog,AmeBel/atomspace,eddiemonroe/opencog,Selameab/opencog,yantrabuddhi/atomspace,rohit12/opencog,shujingke/opencog,printedheart/opencog,ArvinPan/atomspace,AmeBel/atomspace,shujingke/opencog,anitzkin/opencog,gaapt/opencog,anitzkin/opencog,misgeatgit/atomspace,ArvinPan/opencog,TheNameIsNigel/opencog,rTreutlein/atomspace,Tiggels/opencog,eddiemonroe/opencog,gaapt/opencog,jswiergo/atomspace,ruiting/opencog,misgeatgit/atomspace,ArvinPan/opencog,ceefour/opencog,ArvinPan/opencog,sanuj/opencog,Selameab/opencog,kim135797531/opencog,ArvinPan/opencog,yantrabuddhi/atomspace,roselleebarle04/opencog,ruiting/opencog,rohit12/atomspace,kinoc/opencog,gavrieltal/opencog,Selameab/opencog,williampma/opencog,eddiemonroe/atomspace,misgeatgit/opencog,misgeatgit/atomspace,andre-senna/opencog,gavrieltal/opencog,shujingke/opencog,roselleebarle04/opencog,rodsol/atomspace,UIKit0/atomspace,misgeatgit/opencog,Selameab/opencog,inflector/opencog,gaapt/opencog,Selameab/atomspace,anitzkin/opencog,AmeBel/atomspace,inflector/opencog,roselleebarle04/opencog,zhaozengguang/opencog,eddiemonroe/opencog,Selameab/atomspace,zhaozengguang/opencog,Tiggels/opencog,cosmoharrigan/atomspace,virneo/opencog,ruiting/opencog,ruiting/opencog,tim777z/opencog,yantrabuddhi/opencog,AmeBel/opencog,gaapt/opencog,tim777z/opencog,kinoc/opencog,ceefour/opencog,kinoc/opencog,eddiemonroe/opencog,sumitsourabh/opencog,inflector/atomspace,williampma/atomspace,AmeBel/atomspace,ceefour/opencog,inflector/opencog,virneo/opencog,ceefour/opencog,Selameab/opencog,williampma/opencog,rodsol/atomspace,iAMr00t/opencog,shujingke/opencog,AmeBel/opencog,williampma/opencog,yantrabuddhi/opencog,MarcosPividori/atomspace,jswiergo/atomspace,misgeatgit/opencog,UIKit0/atomspace,tim777z/opencog,printedheart/atomspace,inflector/atomspace,sumitsourabh/opencog,gavrieltal/opencog,inflector/opencog,ceefour/atomspace,williampma/atomspace,zhaozengguang/opencog,jlegendary/opencog,williampma/opencog,eddiemonroe/atomspace,rodsol/opencog,virneo/opencog,rohit12/atomspace,ceefour/atomspace,inflector/atomspace,kim135797531/opencog,kinoc/opencog,jlegendary/opencog,ArvinPan/opencog,rodsol/opencog,cosmoharrigan/opencog,UIKit0/atomspace,roselleebarle04/opencog,eddiemonroe/opencog,printedheart/opencog,prateeksaxena2809/opencog,prateeksaxena2809/opencog,ruiting/opencog,kim135797531/opencog,misgeatgit/atomspace,inflector/opencog,AmeBel/opencog,rTreutlein/atomspace,rTreutlein/atomspace,misgeatgit/opencog,cosmoharrigan/atomspace,gavrieltal/opencog,misgeatgit/opencog,yantrabuddhi/opencog,Allend575/opencog,rohit12/atomspace,prateeksaxena2809/opencog,sumitsourabh/opencog