Check for null model objects

As of v2.8.2, peewee will not create model objects with all null
fields when an FK reference is null.  We have to check the model
instances for None.  See:

  https://github.com/coleifer/peewee/issues/1012

buildman/jobutil/buildjob.py

@@ -193,12 +193,13 @@ class BuildJobNotifier(object):
   def send_notification(self, kind, error_message=None, image_id=None, manifest_digests=None):
     with UseThenDisconnect(app.config):
       tags = self.build_config.get('docker_tags', ['latest'])
+      trigger = self.repo_build.trigger
       event_data = {
         'build_id': self.repo_build.uuid,
         'build_name': self.repo_build.display_name,
         'docker_tags': tags,
-        'trigger_id': self.repo_build.trigger.uuid,
-        'trigger_kind': self.repo_build.trigger.service.name,
+        'trigger_id': trigger.uuid if trigger is not None else None,
+        'trigger_kind': trigger.service.name if trigger is not None else None,
         'trigger_metadata': self.build_config.get('trigger_metadata', {})
       }
 

util/secscan/api.py

@@ -221,6 +221,7 @@ class ImplementedSecurityScannerAPI(SecurityScannerAPIInterface):
         'Authorization': auth_header,
       }
 
+    if layer.parent is not None:
       if layer.parent.docker_image_id and layer.parent.storage.uuid:
         layer_request['ParentName'] = compute_layer_id(layer.parent)