'Search and get an aspectclass from string of full or partial
qualified name of the aspect. Similiar to ``__getitem__``, but doesn\'t
raise exception for trying to search non existing aspect.
:param aspectname:
Name of the aspect that should be searched.
:raise MultipleAspectFoundError:
When multiple aspects with same name was found.
:return:
An aspectclass or None.'

def get(self, aspectname):

    try:
        return self[aspectname]
    except AspectNotFoundError:
        return None
