return (err == 0);
if (err != 0) return PR_FALSE;   return (yarn.mYarn_Fill != 0);
static PRBool HasCell(nsIMdbEnv *aEnv, nsIMdbRow* aRow, mdb_column aCol){  mdbYarn yarn;  mdb_err err = aRow->AliasCellYarn(aEnv, aCol, &yarn);  return (err == 0);}