fix crash in table-generator if a row is empty
fix crash in table-generator if a row is empty

michkot/benchexec,ultimate-pa/benchexec,ultimate-pa/benchexec,sosy-lab/benchexec,dbeyer/benchexec,IljaZakharov/benchexec,sosy-lab/benchexec,IljaZakharov/benchexec,sosy-lab/benchexec,martin-neuhaeusser/benchexec,dbeyer/benchexec,IljaZakharov/benchexec,michkot/benchexec,ultimate-pa/benchexec,michkot/benchexec,martin-neuhaeusser/benchexec,dbeyer/benchexec,sosy-lab/benchexec,cheshire/benchexec,bjowac/impara-benchexec,dbeyer/benchexec,ultimate-pa/benchexec,bjowac/impara-benchexec,IljaZakharov/benchexec,sosy-lab/benchexec,sosy-lab/benchexec,cheshire/benchexec,ultimate-pa/benchexec,martin-neuhaeusser/benchexec,bjowac/impara-benchexec,cheshire/benchexec,martin-neuhaeusser/benchexec,ultimate-pa/benchexec