(this.getEdgeValidationError(a,this.model.getTerminal(a,!0),this.model.getTerminal(a,!1))||""):d+(this.getCellValidationError(a)||"");b=this.validateCell(a,b);null!=b&&(d+=b);null==this.model.getParent(a)&&this.view.validate();return 0<d.length||!c?d:null};