fix a table detection bug.
fix a table detection bug.

AmeBel/relex,anitzkin/relex,virneo/relex,AmeBel/relex,ainishdave/relex,linas/relex,anitzkin/relex,rodsol/relex,opencog/relex,rodsol/relex-temp,leungmanhin/relex,virneo/relex,ainishdave/relex,williampma/relex,williampma/relex,rodsol/relex-temp,williampma/relex,virneo/relex,opencog/relex,williampma/relex,linas/relex,rodsol/relex,rodsol/relex-temp,rodsol/relex,AmeBel/relex,anitzkin/relex,virneo/relex,leungmanhin/relex,rodsol/relex-temp,rodsol/relex-temp,linas/relex,anitzkin/relex,opencog/relex,leungmanhin/relex,ainishdave/relex,anitzkin/relex,ainishdave/relex,rodsol/relex