- It's possible that `canSoftDeleteContentHistory` is called without
`ctx.Doer` being set, such as an anonymous user requesting the
`/content-history/detail` endpoint.
- Add a simple condition to always set to `canSoftDelete` to false if an
anonymous user is requesting this, this avoids a panic in the code that
assumes `ctx.Doer` is set.
- Added integration testing.
(cherry picked from commit 0b5db0dcc608e9a9e79ead094a20a7775c4f9559)
(cherry picked from commit 30d168bcc867387f3c94582a4668cce62f77c171)
(cherry picked from commit 19be82b7ef11fe6e0656434dcc69c9ff2f24c702)
(cherry picked from commit 334b703b17a3fbb02e5ad20aea7241a909eb1f13)
