Add error-checking to gar, gdr utilities
Add error-checking to gar, gdr utilities

ArvinPan/atomspace,ArvinPan/atomspace,inflector/atomspace,rTreutlein/atomspace,yantrabuddhi/atomspace,AmeBel/atomspace,inflector/atomspace,rTreutlein/atomspace,AmeBel/atomspace,rTreutlein/atomspace,misgeatgit/atomspace,misgeatgit/atomspace,ArvinPan/atomspace,inflector/atomspace,AmeBel/atomspace,inflector/atomspace,AmeBel/atomspace,rTreutlein/atomspace,inflector/atomspace,misgeatgit/atomspace,yantrabuddhi/atomspace,ArvinPan/atomspace,rTreutlein/atomspace,yantrabuddhi/atomspace,yantrabuddhi/atomspace,AmeBel/atomspace,yantrabuddhi/atomspace,misgeatgit/atomspace,misgeatgit/atomspace