Ignore followup command allowbreak{}

[leomayer]

Is it possible to ignore commands which have no influence on the text and for TeX processing only?

Currently I have code like

\footnote{first footnote}\allowbreak{}%
\footnote{second footnote}

But with the command \allowbreak the whole mechanism doesn't work. I know I can remove it manually but since I do some automatically processing it becomes troublesome for the followup comma and/or full stop.