bluetooth autotest: Handle exception from xmlrpc call

TEST=Ran quick sanity
BUG=b:145749798

Change-Id: I93ef2001c606eda521c3759e8df2efe317b155e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/1954146
Tested-by: Shijin Abraham <shijinabraham@google.com>
Auto-Submit: Shijin Abraham <shijinabraham@google.com>
Reviewed-by: Archie Pusaka <apusaka@chromium.org>
Commit-Queue: Shijin Abraham <shijinabraham@google.com>
diff --git a/client/cros/bluetooth/bluetooth_device_xmlrpc_server.py b/client/cros/bluetooth/bluetooth_device_xmlrpc_server.py
index 122cdec..e7df47c 100755
--- a/client/cros/bluetooth/bluetooth_device_xmlrpc_server.py
+++ b/client/cros/bluetooth/bluetooth_device_xmlrpc_server.py
@@ -190,6 +190,7 @@
         self._adv_mainloop = gobject.MainLoop()
 
 
+    @xmlrpc_server.dbus_safe(False)
     def set_debug_log_levels(self, dispatcher_vb, newblue_vb, bluez_vb,
                              kernel_vb):
         """Enable or disable the debug logs of bluetooth