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

Pipes/WindowsPipes.php

@@ -56,6 +56,9 @@ public function __construct($input, bool $haveReadSupport)
                     $file = sprintf('%s\\sf_proc_%02X.%s', $tmpDir, $i, $name);
 
                     if (!$h = fopen($file.'.lock', 'w')) {
+                        if (file_exists($file.'.lock')) {
+                            continue 2;
+                        }
                         restore_error_handler();
                         throw new RuntimeException('A temporary file could not be opened to write the process output: '.$lastError);
                     }