We had an issue where a repo was using LFS to store a file, but the user
did not push the file. When trying to view the file, Gitea returned a
500 HTTP status code referencing `ErrLFSObjectNotExist`. It appears the
intent was the render this file as plain text, but the conditional was
flipped. I've also added a test to verify that the file is rendered as
plain text.
(cherry picked from commit 1310649331648d747c57a52ea3bc92da85e7d4d1)
Conflicts:
tests/integration/lfs_view_test.go
trivial context conflict
