Added additional file existence check on temporary file cleanup for dumpFile method

Author: gechetspr

Filesystem.php

@@ -695,7 +695,9 @@ public function dumpFile($filename, $content)
 
             $this->rename($tmpFile, $filename, true);
         } finally {
-            @unlink($tmpFile);
+            if (file_exists($tmpFile)) {
+                @unlink($tmpFile);
+            }
         }
     }