null markup

[Graham Percival]

Could \null mimic the behavior of \hspace #0 ?  It would be nice if we
could use it in the following way:

\layout{ raggedright=##t}
{ \fatText
  c4^\markup{ \null aaa}
  c4^\markup{ \null qqq}
  c4^\markup{ \hspace #0 aaa}
  c4^\markup{ \hspace #0 qqq}
}