Spurious warning when moving a file in presence of submodules

Hi,

I'm getting this warning:

  warning: Could not find section in .gitmodules where path=XXX

whenever I use "git mv" to move a file in a repository containing a submodule. The file is outside the submodule and is completely unrelated, so I do not understand the intent of the warning.

My understanding (without looking at the code in detail) is that Git tries to be clever about submodule renames, hence checks whether the source file is a submodule. But then if the lookup fails, it should just silently move on to "normal file move" mode I guess...