Trying to access a certain tag in gogs (accessing /user/repo/src/tagname) fails with error code 500 if that tag has been created as an annotated, rather than a lightweight tag (i.e. -a, -s or -m was applied to git tag).

The log shows:

[Macaron] Started GET /root/gogstest/src/withmessage for 127.0.0.1
2014/09/29 13:12:09 [view.go:123 Home()] [E] ListEntries: exit status 128
[Macaron] Completed /root/gogstest/src/withmessage 500 Internal Server Error in 35.711574ms

As far as my printf debugging went, tree.ListEntries tries to operate on an empty subtree (Commit ID 0000...). Haven't yet fully investigated but this seems to stem from annotated tags having distinct commit objects compared to lightweight tags.

Tested in master (commit 3cfa4a5) as well as dev branch (commit cd084da).

Steps to reproduce:

1. Create git repo
2. Create annotated tag with git tag failtag -m "This will fail"
3. Add remote gogs repository and git push --tags
4. In Gogs, access Releases page for the repo and click on failtag release.