Symbols in information column of omnicomplete

## Information

**VIM version**

```
NVIM v0.2.2
Build type: RelWithDebInfo
LuaJIT 2.1.0-beta3
```

Operating System:

Debian Buster

## What went wrong

Using a minimal `init.vim` with completion the following symbols are in the omnicompletion description column `{^@` I am going to hazard a guess and say these are line breaks and come from LSP/`tsserver`.

Would it be possible to omit them, or replace them with a `...` and put the whole output (with line breaks) in the buffer up the top (I forget what this is called)

## Reproducing the bug

I have uploaded a screenshot of what it looks like here [here](https://imgur.com/a/NbvgpKw).

My `init.vim`:
```
if empty(glob('~/.config/nvim/autoload/plug.vim'))
silent !curl -fLo ~/.config/nvim/autoload/plug.vim --create-dirs
\ https://raw.githubusercontent.com/junegunn/vim-plug/master/plug.vim
autocmd VimEnter * PlugInstall --sync | source $MYVIMRC
endif

let g:ale_completion_enabled = 1
let g:ale_completion_max_suggestions = 10

call plug#begin('~/.vim/plugged')
Plug 'w0rp/ale'
call plug#end()

set completeopt=menu,menuone,preview,noselect,noinsert
```

### :ALEInfo

```
Current Filetype: javascript
Available Linters: ['eslint', 'flow', 'flow-language-server', 'jscs', 'jshint', 'standard', 'tsserver', 'xo']
Enabled Linters: ['eslint', 'flow', 'flow-language-server', 'jscs', 'jshint', 'standard', 'tsserver', 'xo']
Suggested Fixers:
'eslint' - Apply eslint --fix to a file.
'importjs' - automatic imports for javascript
'prettier' - Apply prettier to a file.
'prettier_eslint', 'prettier-eslint' - Apply prettier-eslint to a file.
'prettier_standard', 'prettier-standard' - Apply prettier-standard to a file.
'remove_trailing_lines' - Remove all blank lines at the end of a file.
'standard' - Fix JavaScript files using standard --fix
'trim_whitespace' - Remove all trailing whitespace characters at the end of every line.
'xo' - Fix JavaScript files using xo --fix.
Linter Variables:
let g:ale_javascript_eslint_executable = 'eslint'
let g:ale_javascript_eslint_options = ''
let g:ale_javascript_eslint_suppress_eslintignore = 0
let g:ale_javascript_eslint_suppress_missing_config = 0
let g:ale_javascript_eslint_use_global = 0
let g:ale_javascript_flow_executable = 'flow'
let g:ale_javascript_flow_ls_executable = 'flow'
let g:ale_javascript_flow_ls_use_global = 0
let g:ale_javascript_flow_use_global = 0
let g:ale_javascript_flow_use_home_config = 0
let g:ale_javascript_flow_use_respect_pragma = 1
let g:ale_javascript_jscs_executable = 'jscs'
let g:ale_javascript_jscs_use_global = 0
let g:ale_javascript_jshint_executable = 'jshint'
let g:ale_javascript_jshint_use_global = 0
let g:ale_javascript_standard_executable = 'standard'
let g:ale_javascript_standard_options = ''
let g:ale_javascript_standard_use_global = 0
let g:ale_javascript_tsserver_config_path = ''
let g:ale_javascript_tsserver_executable = 'tsserver'
let g:ale_javascript_tsserver_use_global = 0
let g:ale_javascript_xo_executable = 'xo'
let g:ale_javascript_xo_options = ''
let g:ale_javascript_xo_use_global = 0
Global Variables:
let g:ale_cache_executable_check_failures = v:null
let g:ale_change_sign_column_color = 0
let g:ale_command_wrapper = ''
let g:ale_completion_delay = 100
let g:ale_completion_enabled = 1
let g:ale_completion_max_suggestions = 10
let g:ale_echo_cursor = 1
let g:ale_echo_msg_error_str = 'Error'
let g:ale_echo_msg_format = '%code: %%s'
let g:ale_echo_msg_info_str = 'Info'
let g:ale_echo_msg_warning_str = 'Warning'
let g:ale_enabled = 1
let g:ale_fix_on_save = 0
let g:ale_fixers = {}
let g:ale_history_enabled = 1
let g:ale_history_log_output = 1
let g:ale_keep_list_window_open = 0
let g:ale_lint_delay = 200
let g:ale_lint_on_enter = 1
let g:ale_lint_on_filetype_changed = 1
let g:ale_lint_on_insert_leave = 0
let g:ale_lint_on_save = 1
let g:ale_lint_on_text_changed = 'always'
let g:ale_linter_aliases = {}
let g:ale_linters = {}
let g:ale_linters_explicit = 0
let g:ale_list_vertical = 0
let g:ale_list_window_size = 10
let g:ale_loclist_msg_format = '%code: %%s'
let g:ale_max_buffer_history_size = 20
let g:ale_max_signs = -1
let g:ale_maximum_file_size = v:null
let g:ale_open_list = 0
let g:ale_pattern_options = v:null
let g:ale_pattern_options_enabled = v:null
let g:ale_set_balloons = 0
let g:ale_set_highlights = 1
let g:ale_set_loclist = 1
let g:ale_set_quickfix = 0
let g:ale_set_signs = 1
let g:ale_sign_column_always = 0
let g:ale_sign_error = '>>'
let g:ale_sign_info = '--'
let g:ale_sign_offset = 1000000
let g:ale_sign_style_error = '>>'
let g:ale_sign_style_warning = '--'
let g:ale_sign_warning = '--'
let g:ale_statusline_format = v:null
let g:ale_type_map = {}
let g:ale_use_global_executables = v:null
let g:ale_virtualtext_cursor = 0
let g:ale_warn_about_trailing_blank_lines = 1
let g:ale_warn_about_trailing_whitespace = 1
Command History:
(executable check - failure) eslint
(executable check - failure) jscs
(executable check - failure) jshint
(executable check - failure) standard
(executable check - failure) xo
(executable check - failure) eslint
(executable check - failure) jscs
(executable check - failure) jshint
(executable check - failure) standard
(executable check - failure) xo
(executable check - failure) eslint
(executable check - failure) jscs
(executable check - failure) jshint
(executable check - failure) standard
(executable check - failure) xo
(executable check - failure) eslint
(executable check - failure) jscs
(executable check - failure) jshint
(executable check - failure) standard
(executable check - failure) xo
```