[datafeed parser] only update an entity attributes when needed. Closes #1989142
This may avoid error with some entities which have immutable attributes
and don't check something actually changed.
Also, avoid modifying the cached item representation, this may cause pb
when an item is seen several times during an import.
# copyright %(year)s %(author)s, all rights reserved.
# contact %(author-web-site)s -- mailto:%(author-email)s
#
%(long-license)s
"""%(distname)s postcreate script, executed at instance creation time or when
the cube is added to an existing instance.
You could setup site properties or a workflow here for example.
"""
# Example of site property change
#set_property('ui.site-title', "<sitename>")