Fix ScopeLink::is_equal when the argument is not a ScopeLink
Fix ScopeLink::is_equal when the argument is not a ScopeLink

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