Unfortunately, the removal shell script introduced in #10860 does not handle paths very well that dont exist, e.g.
* `find` runs before its `-exec` test, thus throws `find: "${path}": No such file or directory`
* it seem that `/bin/rmdir` is intended to break is certain cases, thus `-f` is not desired.
so, if `${path}` does not exist, it'll still break, which is most likely not one of those cases.
This change reintroduces a check for existence. This way, it is ensured that there is actually
a directory to be removed when invoking the script.
