catch exception from rethinkdb when unregistering from the service registry at shutdown

brozzler/worker.py

@@ -360,7 +360,12 @@ class BrozzlerWorker:
             self.logger.critical("thread exiting due to unexpected exception", exc_info=True)
         finally:
             if self._service_registry and hasattr(self, "status_info"):
-                self._service_registry.unregister(self.status_info["id"])
+                try:
+                    self._service_registry.unregister(self.status_info["id"])
+                except:
+                    self.logger.error(
+                            "failed to unregister from service registry",
+                            exc_info=True)
 
     def start(self):
         th = threading.Thread(target=self.run, name="BrozzlerWorker")

setup.py

@@ -20,7 +20,7 @@ import setuptools
 import glob
 
 setuptools.setup(name='brozzler',
-        version='1.1.dev9',
+        version='1.1.dev10',
         description='Distributed web crawling with browsers',
         url='https://github.com/nlevitt/brozzler',
         author='Noah Levitt',