Enable sisyphus to recover from bad DNS without restart (#32846)

homeassistant/components/sisyphus/__init__.py

@@ -99,18 +99,23 @@ class TableHolder:
 
     async def get_table(self):
         """Return the Table held by this holder, connecting to it if needed."""
+        if self._table:
+            return self._table
+
         if not self._table_task:
             self._table_task = self._hass.async_create_task(self._connect_table())
 
         return await self._table_task
 
     async def _connect_table(self):
-
-        self._table = await Table.connect(self._host, self._session)
-        if self._name is None:
-            self._name = self._table.name
-            _LOGGER.debug("Connected to %s at %s", self._name, self._host)
-        return self._table
+        try:
+            self._table = await Table.connect(self._host, self._session)
+            if self._name is None:
+                self._name = self._table.name
+                _LOGGER.debug("Connected to %s at %s", self._name, self._host)
+            return self._table
+        finally:
+            self._table_task = None
 
     async def close(self):
         """Close the table held by this holder, if any."""