git checkout --recurse-submodules doesn't like checking out an older commit after a submodule was removed

[Mike Hommey <mh@xxxxxxxxxxxx>]

Hi,

Doing the following fails:

$ git clone --recurse-submodules https://github.com/trailofbits/winchecksec/
$ cd winchecksec
$ git checkout --recurse-submodules 93ffe67dbfc757bf6f440d80b8acf88e652ed60a
fatal: not a git repository: ../.git/modules/pe-parse
fatal: could not reset submodule index

The main reason is that the pe-parse directory/submodule was removed in
the commit that follows 93ffe67dbfc757bf6f440d80b8acf88e652ed60a (which
is current master).

This also leaves the tree in a bad state, and it's hard to fix anything
from that state.

Mike