Merge pull request #1926 from gnustomp/master

c#ParseCFlags: don't index empty list

autoload/ale/c.vim

@@ -55,7 +55,7 @@ function! ale#c#ParseCFlags(path_prefix, cflag_line) abort
         " Check if cflag contained a '-' and should not have been splitted
         let l:option_list = split(l:option, '\zs')
 
-        if l:option_list[-1] isnot# ' '
+        if len(l:option_list) > 0 && l:option_list[-1] isnot# ' '
             continue
         endif