#810 - Handle output which is not JSON in many linters

ale_linters/ruby/rails_best_practices.vim

@@ -5,17 +5,11 @@ let g:ale_ruby_rails_best_practices_options =
 \   get(g:, 'ale_ruby_rails_best_practices_options', '')
 
 function! ale_linters#ruby#rails_best_practices#Handle(buffer, lines) abort
-    if len(a:lines) == 0
-        return []
-    endif
-
-    let l:result = json_decode(join(a:lines, ''))
-
     let l:output = []
 
-    for l:warning in l:result
+    for l:warning in ale#util#FuzzyJSONDecode(a:lines, [])
         if !ale#path#IsBufferPath(a:buffer, l:warning.filename)
-          continue
+            continue
         endif
 
         call add(l:output, {