integrations: skip executing EE integrations activated from EE but not present in downgrade at CE.

rhodecode/model/integration.py

@@ -30,6 +30,7 b' from sqlalchemy import or_, and_'
 
 import rhodecode
 from rhodecode import events
+from rhodecode.integrations.types.base import EEIntegration
 from rhodecode.lib.caching_query import FromCache
 from rhodecode.model import BaseModel
 from rhodecode.model.db import Integration, Repository, RepoGroup
@@ -89,6 +90,11 b' class IntegrationModel(BaseModel):'
             log.error('No class could be found for integration type: {}'.format(
                 integration.integration_type))
             return None
+        elif isinstance(TypeClass, EEIntegration) or issubclass(TypeClass, EEIntegration):
+            log.error('EE integration cannot be '
+                      'executed for integration type: {}'.format(
+                integration.integration_type))
+            return None
 
         return TypeClass(integration.settings)