Bug fix for crash bug #1710
Bug fix for crash bug #1710

Specifically, for https://github.com/opencog/opencog/issues/1710

AmeBel/atomspace,AmeBel/atomspace,ceefour/atomspace,rodsol/atomspace,rTreutlein/atomspace,cosmoharrigan/atomspace,Selameab/atomspace,printedheart/atomspace,inflector/atomspace,rTreutlein/atomspace,AmeBel/atomspace,inflector/atomspace,ArvinPan/atomspace,MarcosPividori/atomspace,Selameab/atomspace,printedheart/atomspace,yantrabuddhi/atomspace,williampma/atomspace,UIKit0/atomspace,rodsol/atomspace,UIKit0/atomspace,UIKit0/atomspace,yantrabuddhi/atomspace,virneo/atomspace,printedheart/atomspace,ceefour/atomspace,inflector/atomspace,ceefour/atomspace,yantrabuddhi/atomspace,ArvinPan/atomspace,rTreutlein/atomspace,cosmoharrigan/atomspace,cosmoharrigan/atomspace,virneo/atomspace,cosmoharrigan/atomspace,Selameab/atomspace,virneo/atomspace,misgeatgit/atomspace,MarcosPividori/atomspace,misgeatgit/atomspace,misgeatgit/atomspace,printedheart/atomspace,williampma/atomspace,AmeBel/atomspace,misgeatgit/atomspace,rTreutlein/atomspace,inflector/atomspace,Selameab/atomspace,williampma/atomspace,ArvinPan/atomspace,MarcosPividori/atomspace,inflector/atomspace,williampma/atomspace,AmeBel/atomspace,yantrabuddhi/atomspace,MarcosPividori/atomspace,rodsol/atomspace,ceefour/atomspace,UIKit0/atomspace,rTreutlein/atomspace,virneo/atomspace,ArvinPan/atomspace,rodsol/atomspace,misgeatgit/atomspace,yantrabuddhi/atomspace