allow ctrl+c to interrupt watch-lock without printing a python stack dump

jsvn

@@ -568,6 +568,7 @@ def watch_lock(argv, svn, out):
                 break
 
     last_lock_owner = ''
+    try:
         while True:
             lock_owner = ''
             p = Popen([svn, 'info', path], stdout=PIPE)
@@ -583,7 +584,6 @@ def watch_lock(argv, svn, out):
                 out.write('Locked by: %s\n' % lock_owner)
                 last_lock_owner = lock_owner
             time.sleep(60)
-
         out.write('''
  _   _       _            _            _ _
 | | | |_ __ | | ___   ___| | _____  __| | |
@@ -592,6 +592,8 @@ def watch_lock(argv, svn, out):
  \___/|_| |_|_|\___/ \___|_|\_\___|\__,_(_)
 
 ''')
+    except KeyboardInterrupt:
+        pass
     return RET_OK
 
 def users(argv, svn, out):