host.main_sr: don't return "<not in database>" as UUID on missing default-SR

Signed-off-by: Yann Dirson <[email protected]>

Author: ydirson

lib/host.py

@@ -480,6 +480,7 @@ def main_sr(self):
         else:
             sr_uuid = self.pool.param_get('default-SR')
             assert sr_uuid, f"DEFAULT_SR='default' so there must be a default SR on the pool of host {self}"
+        assert sr_uuid != "<not in database>"
         return sr_uuid
 
     def hostname(self):