tree ab540cb9e95152b94a1d752e1ea5782074c8df4e
parent e752292f26c5cf0558bc306e49daff11d904447f
author Jeff Gaston <jeffrygaston@google.com> 1519696825 -0500
committer Jeff Gaston <jeffrygaston@google.com> 1519782773 -0500

Clearer error if module doesn't declare any source files

Bug: 72552006
Test: Make a module with no source files,
      run `m -j nothing`, notice that the error tells
      which module has no sources

Change-Id: Ib169e7b3cb86d840a3acd644e42cd1f9f65e1304