snapshot fix

colony/core/roles/explorer/role.py

@@ -26,7 +26,7 @@ class Explorer(Role):
 
     def loop(self):
         self.logger.info("Getting network snapshot")
-        snapshot = self.get_snapshot()['result']
+        snapshot = self.get_snapshot()['result'] or {}
         self.logger.debug(f"Loaded snapshot")
 
         discovered_peers = self.discover_peers()