Update argon

ale_linters/haskell/argon.vim

@@ -27,6 +27,11 @@ function! ale_linters#haskell#argon#Handle(buffer, lines) abort
     let l:output = []
 
     for l:error in ale#util#FuzzyJSONDecode(a:lines, [])
+		if !has_key(l:error, 'blocks')
+			" this cannot be formatted properly into an ALE error
+			execute 'echom ''[argon] '' l:error.message'
+			return l:output
+		endif
 		for l:block in l:error.blocks
 			let l:complexity = l:block.complexity
 
@@ -43,8 +48,8 @@ function! ale_linters#haskell#argon#Handle(buffer, lines) abort
 
 			call add(l:output, {
 			\   'filename': l:error.path,
-            \   'lnum': str2nr(l:block.lineno),
-            \   'col': str2nr(l:block.col),
+			\   'lnum': l:block.lineno,
+			\   'col': l:block.col,
 			\   'text': l:block.name . ': cyclomatic complexity of '  . l:complexity,
 			\   'type': l:type,
 			\})