Update floatup.py from upstream

floatup.py

@@ -198,7 +198,7 @@ def main():
             do_request(args.url + '/api/stop-group', args.ssh, req)
         except:
             pass
-        if args.state_file:
+        if args.state_file and os.path.exists(args.state_file):
             os.remove(args.state_file)