Unable to iterate commits on all branches for a specific path (KeyNotFoundException)

When you attempt to use repository.QueryBy(string, CommitFilter) and specify all branches as the IncludeReachableFrom parameter, a KeyNotFound exception is thrown.

Reproduction steps

Add the following test to FileHistoryFixture to reproduce the issue

        [Fact]
        public void CanListChangesThatIncludeMultipleBranches()
        {
            var repoPath = CreateEmptyRepository();
            const string path1 = "Test1.txt";
            const string path2 = "Test2.txt";

            using (var repo = new Repository(repoPath))
            {
                // Make initial changes.
                var initial = MakeAndCommitChange(repo, repoPath, path1, "Hello World", "initial commit");
                MakeAndCommitChange(repo, repoPath, path2, "Goodbye world", "unrelated file change 1");
                var update1 = MakeAndCommitChange(repo, repoPath, path1, "Hello World!", "added punctuation");
                var branch = repo.CreateBranch("branch");
                Commands.Checkout(repo, branch);
                var branchUpdate = MakeAndCommitChange(repo, repoPath, path1, "Hello World again", "branch change");
                MakeAndCommitChange(repo, repoPath, path2, "Goodbye cruel world", "unrelated file change 2");
                Commands.Checkout(repo, repo.Branches["master"]);
                var update2 = MakeAndCommitChange(repo, repoPath, path1, "Hola Mundo", "switching to spanish");

                var commits = repo.Commits
                    .QueryBy(path1, new CommitFilter { IncludeReachableFrom = repo.Branches, SortBy = CommitSortStrategies.Topological})
                    .ToList();

                Assert.Equal(4, commits.Count);
                Assert.Equal(branchUpdate.Sha, commits[0].Commit.Sha);
                Assert.Equal(update2.Sha, commits[1].Commit.Sha);
                Assert.Equal(update1.Sha, commits[2].Commit.Sha);
                Assert.Equal(initial.Sha, commits[3].Commit.Sha);
            }
        }

Version of LibGit2Sharp (release number or SHA1)

f8e2d42ed9051fa5a5348c1a13d006f0cc069bc7

Add the supplied regression test to FileHistoryFixture and run it against repository.Commits.QueryBy with the multi-branch CommitFilter. Trace the QueryBy path that handles IncludeReachableFrom and compare its behavior with the expected four commits. Done means the test no longer throws KeyNotFoundException and returns the four commits in the asserted order.