chore: fix timeout_height func

Author: achilleas-kal

pyinjective/async_client.py

@@ -173,8 +173,11 @@ async def close_chain_channel(self):
         self.cron.stop()
 
     async def sync_timeout_height(self):
-        block = await self.get_latest_block()
-        self.timeout_height = block.block.header.height + DEFAULT_TIMEOUTHEIGHT
+        try:
+            block = await self.get_latest_block()
+            self.timeout_height = block.block.header.height + DEFAULT_TIMEOUTHEIGHT
+        except Exception as e:
+            self.timeout_height = 0
 
     # cookie helper methods
     async def fetch_cookie(self, type):