deplace pid file creation in child process

radicale/__main__.py

@@ -103,11 +103,10 @@ def run():
             raise OSError("PID file exists: %s" % config.get("server", "pid"))
         pid = os.fork()
         if pid:
-            try:
+            sys.exit()
+        else:
             if config.get("server", "pid"):
                 open(config.get("server", "pid"), "w").write(str(pid))
-            finally:
-                sys.exit()
         sys.stdout = sys.stderr = open(os.devnull, "w")
 
     # Register exit function