tree 9411a06b4831c9612ce069b9bd3a20c965d05514
parent 9323b430b99fd8b1b645d4beec4dba158ff29610
author Ivan Frade <ifrade@google.com> 1697231197 -0700
committer Ivan Frade <ifrade@google.com> 1697582751 -0700

DfsPackFile: Do not attempt to read stream if pack doesn't have it

Other getters (e.g. bitmap or commit graph) cover the case that the
pack doesn't have the corresponding extension.

Do the same here to detect this early and avoid an IOException in
openFile.

Change-Id: I29726b7ede0f795d35543453a3e7f92cee872a78