[slapconfiguration] Don't expect new attributes to exist on all machines

slapos/recipe/slapconfiguration.py

@@ -249,6 +249,7 @@ class Recipe(object):
 
       # The external information transfered from Slap Master has been processed
       # so we extend with information gathered from partition resource file
+      if hasattr(slapformat.Partition, "resource_file"):
         resource_home = instance_root
         while not os.path.exists(os.path.join(resource_home, slapformat.Partition.resource_file)):
           resource_home = os.path.normpath(os.path.join(resource_home, '..'))