FileHistory return empty enumerable for deleted files

Reproduction steps

1. Create a file and commit
2. Delete the file and commit
3. Query the log for that specific file: IEnumerable<LogEntry> logs = repo.Commits.QueryBy(fileName);

Expected behavior

The logs enumerable contains 2 entries (initial commit and delete commit)

Actual behavior

The logs enumerable is empty

Version of LibGit2Sharp (release number or SHA1)

v0.25.2

Operating system(s) tested; .NET runtime tested

Windows 7
.Net Framework 4.7.1

Note that git log will also (by default) not return any results when specifying the file name only:

However, when telling git explicitly if a revision or a file is specified, git log will show the expected results:

从 repo.Commits.QueryBy(fileName) 入口开始，复现 issue 中描述的已删除文件历史记录。将其对文件参数的处理方式与报告中提到的 git log 行为进行比较。完成的标准是查询返回初始提交和删除提交，并有一个覆盖该序列的回归测试。