tools/manifestfile.py: Fix freeze() when script is an empty iterable.

The documentation for `freeze()` says that:
- If `script` is `None`, all files in `path` will be frozen.
- If `script` is an iterable then `freeze()` is called on all items of the
  iterable.

This commit makes sure this behaviour is followed when an empty tuple/list
is passed in for `script` (previously an empty tuple/list froze all files).

Fixes issue #14125.

Signed-off-by: Damien George <damien@micropython.org>

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