In order to determine who deleted a message, Octobot fetches the audit
log with a filter on the action "Message Delete", gets the latest entry
and uses its author if the timestamps roughly match. However, if the
filter returns no entries (as in, no message deletions are present in
the audit log), `Single()` will throw an exception with the message
`Sequence contains no elements`. To fix this, this PR replaces
`Single()` with `SingleOrDefault()` and adds a null-check on `auditLog`
in the form of a pattern access
Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>
Apparently the `[UsedImplicitly]` annotation suppresses the "Class has
no inheritors and can be marked sealed" warning. Cool to know.
Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>
1. The root namespace was changed from `Octobot` to
`TeamOctolings.Octobot`:
> DO prefix namespace names with a company name to prevent namespaces
from different companies from having the same name.
2. `Octobot.cs` was renamed to `Program.cs`:
> DO NOT use the same name for a namespace and a type in that namespace.
3. `IOption`, `Option` were renamed to `IGuildOption` and `GuildOption`
respectively:
> DO NOT introduce generic type names such as Element, Node, Log, and
Message.
4. `Utility` was moved out of the `Services` namespace. It didn't belong
there anyway
5. `Program` static fields were moved to `Utility`
6. Localisation files were moved back to the project source files. Looks
like this fixed `Message.Designer.cs` code generation
---------
Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>
