`cabal haddock <arbitrary package>` produces nothing

**Describe the bug** / **To Reproduce**

E.g.

```
$ cabal haddock text
```

Produces nothing and exits with 0. Might be because `text` is only a dependency? But I think it is not unreasonable to expect this to work. The `--help` says:

```
Examples:
cabal haddock pkgname Build documentation for the package named pkgname
```

**Expected behavior**
Some documentation should be produced.

**System information**
- Operating system: NixOS

```
$ cabal --version
cabal-install version 3.10.1.0
compiled using version 3.10.1.0 of the Cabal library
$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 9.4.6
```

No source file or test is named. Start by reproducing `cabal haddock text` with the reported Cabal and GHC versions, then trace how the haddock command resolves a package name versus a dependency. Done means the documented command produces documentation or clearly reports why the package cannot be selected.

Written by the indexing model from the issue text.