Clarify fetch error for missing objects.
Clarify fetch error for missing objects.

Otherwise there're such things like:

    Cannot obtain needed none 9a6e87b60dbd2305c95cecce7d9d60f849a0658d
    while processing commit 0000000000000000000000000000000000000000.

which while looks weird. What is the none needed for?

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git