Remove useless 'file is not empty' comments from __init__.py files

[mkoeppe]

This is for #32501 and will make it easier to see which of the __init__.py files have an actual content.

Having this comment there appears to have been a workaround for hg, which is now irrelevant.

CC: @tscrim @fchapoton

Component: refactoring

Author: Matthias Koeppe

Branch/Commit: 1c106cd

Reviewer: Frédéric Chapoton

Issue created by migration from https://trac.sagemath.org/ticket/32506

[mkoeppe]

Branch: u/mkoeppe/remove_useless__file_is_not_empty__comments_from___init___py_files

[mkoeppe]

Commit: 1c106cd

[mkoeppe]

New commits:

1c106cd

Remove useless 'file is not empty' comments from __init__.py files

[mkoeppe]

Author: Matthias Koeppe

[fchapoton]

comment:3

ok

[fchapoton]

Reviewer: Frédéric Chapoton

[mkoeppe]

comment:4

Thanks

[vbraun]

Changed branch from u/mkoeppe/remove_useless__file_is_not_empty__comments_from___init___py_files to 1c106cd