linting support of solidity(with solc) does not work due to empty input

## Information

**VIM version**:
NVIM v0.5.0-dev+1053-g459a6c845
Build type: RelWithDebInfo
LuaJIT 2.1.0-beta3
Compilation: /usr/bin/cc -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -O2 -g -Og -g -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wmissing-prototypes -Wvla -fstack-protector-strong -fno-common -fdiagnostics-color=always -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -DMIN_LOG_LEVEL=3 -I/home/runner/work/neovim/neovim/build/config -I/home/runner/work/neovim/neovim/src -I/home/runner/work/neovim/neovim/.deps/usr/include -I/usr/include-I/home/runner/work/neovim/neovim/build/src/nvim/auto -I/home/runner/work/neovim/neovim/build/include
Compiled by runner@fv-az207-534

**Operating System**: WSL 20.04 LTS

**solc version**: 0.8.1+commit.df193b15.Linux.g++

## What went wrong

Linting support for solidity with solc does not work.

## Reproducing the bug

1. Prepare code with trivial syntax error.

```
// sample.sol
pragma solidity >=0.8.0;

contract SimpleStrage {
uint256 storedData // misisng ";"
}
```

2. find no error symbol '>'(in my environment).

3. check the contents of [ale_linters/solidity/solc.vim](https://github.com/dense-analysis/ale/blob/master/ale_linters/solidity/solc.vim) .

```
" Author: Karl Bartel - http://karl.berlin/
" Description: Report solc compiler errors in Solidity code

call ale#Set('solidity_solc_options', '')

function! ale_linters#solidity#solc#Handle(buffer, lines) abort
" Matches patterns like the following:
" /path/to/file/file.sol:1:10: Error: Identifier not found or not unique.
let l:pattern = '\v^[^:]+:(\d+):(\d+): (Error|Warning): (.*)$'
let l:output = []

for l:match in ale#util#GetMatches(a:lines, l:pattern)
let l:isError = l:match[3] is? 'error'
call add(l:output, {
\ 'lnum': l:match[1] + 0,
\ 'col': l:match[2] + 0,
\ 'text': l:match[4],
\ 'type': l:isError ? 'E' : 'W',
\})
endfor

return l:output
endfunction

function! ale_linters#solidity#solc#GetCommand(buffer) abort
return 'solc' . ale#Pad(ale#Var(a:buffer, 'solidity_solc_options')) . ' %s'
endfunction

call ale#linter#Define('solidity', {
\ 'name': 'solc',
\ 'executable': 'solc',
\ 'command': function('ale_linters#solidity#solc#GetCommand'),
\ 'callback': 'ale_linters#solidity#solc#Handle',
\ 'output_stream': 'stderr',
\})
```

4. check function call of ale_linters#solidity#solc#Handle. Insert

```
echom "len(a:lines) -> " . len(a:lines)
```

and do print debug.

5. find output "len(a:lines) -> 0"(empty input). However, in ALEInfo, I can find the command history that solc is properly called by ale.

### :ALEInfo

```
ALEInfo
Current Filetype: solidity
Available Linters: ['solc', 'solium']
Enabled Linters: ['solc']
Ignored Linters: []
Suggested Fixers:
'remove_trailing_lines' - Remove all blank lines at the end of a file.
'trim_whitespace' - Remove all trailing whitespace characters at the end of every line.
Linter Variables:
'remove_trailing_lines' - Remove all blank lines at the end of a file.
'trim_whitespace' - Remove all trailing whitespace characters at the end of every line.
Linter Variables:
let g:ale_solidity_solc_options = ''
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 = v:null
let g:ale_completion_enabled = 0
let g:ale_completion_max_suggestions = v:null
let g:ale_disable_lsp = 1
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 = 1
let g:ale_fixers = {'rust': ['rustfmt'], 'c': ['clang-format'], 'solidity': ['prettier'], 'xml': ['prettier'], 'html': ['prettier'],
'javascript': ['prettier'], '*': ['remove_trailing_lines', 'trim_whitespace'], 'cpp': ['clang-format'], 'markdown': ['prettier'], 'ja
va': ['google_java_format'], 'python': ['black', 'add_blank_lines_for_python_control_statements', 'isort'], 'css': ['prettier']}
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 = 1
let g:ale_lint_on_save = 1
let g:ale_lint_on_text_changed = 1
let g:ale_linter_aliases = {}
let g:ale_linters = {'vim': ['vint'], 'c': ['cc'], 'solidity': ['solc'], 'html': ['htmlhint'], 'rust': ['cargo', 'rustc'], 'cpp': ['c
c'], 'python': ['pyls', 'flake8']}
let g:ale_linters_explicit = 0
let g:ale_linters_ignore = {}
let g:ale_list_vertical = 0
let g:ale_list_window_size = 10
let g:ale_loclist_msg_format = '%code: %%s'
let g:ale_lsp_root = {}
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_sign_warning = '> '
let g:ale_sign_highlight_linenrs = 0
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 = 1
let g:ale_warn_about_trailing_blank_lines = 1
let g:ale_warn_about_trailing_whitespace = 1
Command History:
(executable check - success) solc
(finished - exit code 1) ['/usr/bin/zsh', '-c', 'solc ''/patj/to/sample.sol'' < ''/tmp/nvim00QyRf/1/sample.sol''']
<<>>
Error: Expected ';' but got '}'
--> /root/codes/solidity_practice/tutorial.sol:5:1:
|
5 | }
| ^
<<>>
```