HLS hangs when given an invalid hlint annotation

### Your environment
Output of `haskell-language-server --probe-tools` or `haskell-language-server-wrapper --probe-tools`:

```sh
❯ haskell-language-server-wrapper --probe-tools
haskell-language-server version: 1.1.0.0 (GHC: 8.10.4) (PATH: /nix/store/yc9ljhg8fgb8k8zjlgid04qkq3ffzm5s-haskell-language-server-1.1.0.0/bin/haskell-language-server-wrapper)
Tool versions found on the $PATH
cabal: 3.4.0.0
stack: Not found
ghc: 8.10.4

```
Which OS do you use:

Which lsp-client do you use: coc.nvim in neovim on nixos

Describe your project (alternative: link to the project): this commit https://github.com/expipiplus1/fourmolu/commit/6091ab424fc6ad423e6ce005dda9c990e850e212#diff-7db35ce2b13b8bb7dc43a789dc3cf6074abe57a77051f98a5e7090a09bb6b206R42

Contents of `hie.yaml`:
```yaml
cradle:
multi:
- path: "data"
config: { cradle: { none: }}
- path: "region-tests"
config: { cradle: { none: }}

- path: "."
config:
cradle:
cabal:
- path: "src"
component: "lib:fourmolu"

- path: "app"
component: "fourmolu:exe:fourmolu"

- path: "tests"
component: "fourmolu:test:tests"

```

### Steps to reproduce

Clone fourmolu at this commit https://github.com/expipiplus1/fourmolu/commit/6091ab424fc6ad423e6ce005dda9c990e850e212#diff-7db35ce2b13b8bb7dc43a789dc3cf6074abe57a77051f98a5e7090a09bb6b206R42

### Expected behaviour

hls should terminate

### Actual behaviour

`haskell-language-server` doesn't terminate, the last message is

```
/home/j/src/fourmolu/src/Ormolu/Printer/Meat/Declaration/Value.hs:42:16-56: Error while reading hint file, bad classify pragma
("Hlint: inore use camelCase " :: String)
```

(not the misspelled 'ignore')

It does respond to SIGTERM

### Include debug information
Execute in the root of your project the command `haskell-language-server --debug .` and paste the logs here:

https://gist.github.com/2e49d2524c9faaa638bebaa919943c82

Things work correctly when 'ignore' is spelled correctly.