slapos_panel: do no crash when fetching project

master/bt5/slapos_panel/SkinTemplateItem/portal_skins/slapos_panel/Base_hasSlapOSProjectUserGroup.py

 portal = context.getPortalObject()
+checked_permission = 'Access contents information'
 
 if project_relation == 'context':
   project = context
 elif project_relation == 'follow_up':
-  project = context.getFollowUpValue()
+  project = context.getFollowUpValue(checked_permission=checked_permission)
 elif project_relation == 'destination_project':
-  project = context.getDestinationProjectValue()
+  project = context.getDestinationProjectValue(checked_permission=checked_permission)
 elif project_relation == 'source_project':
-  project = context.getSourceProjectValue()
+  project = context.getSourceProjectValue(checked_permission=checked_permission)
 else:
   raise ValueError('Unexpected project relation: %s' % project_relation)