Merge branch '3.4' into 4.4

* 3.4:
  [Process] Fix Permission Denied error when writing sf_proc_00 lock files on Windows
  fix handling null as empty data
  No need to create an issue when creating a PR
  [Console] Fixes question input encoding on Windows

Author: nicolas-grekas

Helper/QuestionHelper.php

@@ -108,6 +108,11 @@ private function doAsk(OutputInterface $output, Question $question)
         $inputStream = $this->inputStream ?: STDIN;
         $autocomplete = $question->getAutocompleterCallback();
 
+        if (\function_exists('sapi_windows_cp_set')) {
+            // Codepage used by cmd.exe on Windows to allow special characters (éàüñ).
+            sapi_windows_cp_set(1252);
+        }
+
         if (null === $autocomplete || !self::$stty || !Terminal::hasSttyAvailable()) {
             $ret = false;
             if ($question->isHidden()) {