Auto merge of #1250 - alexcrichton:issue-1248, r=brson
authorbors <bors@rust-lang.org>
Fri, 30 Jan 2015 02:47:30 +0000 (02:47 +0000)
committerbors <bors@rust-lang.org>
Fri, 30 Jan 2015 02:47:30 +0000 (02:47 +0000)
When probing a repository for files that should be considered as inputs for a
build script we should just skip submodules that haven't been checked out
instead of throwing an error.

Closes #1248


Trivial merge