fix: TOOLS-2976 manage truncate fails when set DNE

lib/live_cluster/client/assocket.py

@@ -98,11 +98,11 @@ async def _create_socket_for_addrinfo(self, addrinfo):
 
             """We are creating our own socket, optionally wrapping it with an SSL.Context (not the same as ssl.SSLContext)
             to get an SSL.Connection (same interface as a socket.socket). Further up the stack we pass this socket to asyncio.open_connection
-            to create streams. The perfered way of creating a socket would be to
+            to create streams. The preferred way of creating a socket would be to
             allow asyncio create the socket (ssl or not) by passing the ssl_context (or None) to asyncio.open_connection. However, ssl_context must
             be an instance of ssl.SSLContext, which is not compatible with SSL.Context which is what we use. SSL.Context enables a higher level
             of control over certificate verification which we need (see ./ssl_context.py). Another solution might be to create a custom implementation
-            of he asyncio Transport that uses pyOpenSSL.SSL.Context (or use https://github.com/horazont/aioopenssl) but that would be a 
+            of the asyncio Transport that uses pyOpenSSL.SSL.Context (or use https://github.com/horazont/aioopenssl) but that would be a 
             considerable amount of work.
             """
             await asyncio.wait_for(

lib/live_cluster/client/node.py

@@ -1097,7 +1097,7 @@ async def info_all_namespace_statistics(self):
     async def info_set_statistics(self, namespace, set_):
         set_stat = await self._info("sets/{}/{}".format(namespace, set_))
 
-        if set_stat[-1] == ";":
+        if set_stat and set_stat[-1] == ";":
             set_stat = client_util.info_colon_to_dict(set_stat[0:-1])
         else:
             set_stat = client_util.info_colon_to_dict(set_stat)