iMOSES: fix for crash w/ trivial tree
iMOSES: fix for crash w/ trivial tree

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