MB-60592 Setting notifs on uninitialised cluster

This PR removes the version check as it is already being checked in the
decorator function.

Change-Id: I888e8d06c18487ec6f232fce9b963c9d5d268335
Reviewed-on: https://review.couchbase.org/c/couchbase-cli/+/204911
Well-Formed: Restriction Checker
Tested-by: Nour Elmenyawi <nour.elmenyawi@couchbase.com>
Reviewed-by: Matt Hall <matt.hall@couchbase.com>

Author: nourelmenyawi

cbmgr.py

@@ -3173,6 +3173,11 @@ def __init__(self):
     @rest_initialiser(version_check=True, enterprise_check=False)
     def execute(self, opts):
         min_version, errors = self.rest.min_version()
+        if errors is not None:
+            # We fallback to node_version as min_version checks the cluster version and would fail
+            # if the cluster is not initialised. node_version checks the version of the node instead.
+            # See MB-60592 for more information.
+            min_version, errors = self.rest.node_version()
         _exit_if_errors(errors)
 
         if not self.enterprise and min_version >= "7.2.3":