Set default value for partition available parameter

While testing NFS storage pool with invalid host and path, partition
information will be empty and it was raising an exception. Fix it by
adding a default value for partition 'available' parameter.

Signed-off-by: Aline Manera <aline.manera@gmail.com>

control/host.py

@@ -96,7 +96,7 @@ def __init__(self, model):
     # sorted by their path
     def _get_resources(self, flag_filter):
         res_list = super(Partitions, self)._get_resources(flag_filter)
-        res_list = list(filter(lambda x: x.info['available'], res_list))
+        res_list = list(filter(lambda x: x.info.get('available', False), res_list))
         if is_s390x():
             # On s390x arch filter out the DASD block devices which
             # don't have any partition(s). This is necessary because
@@ -123,7 +123,7 @@ def __init__(self, model, id):
 
     @property
     def data(self):
-        if not self.info['available']:
+        if not self.info.get('available', False):
             raise NotFoundError('KCHPART0001E', {'name': self.info['name']})
 
         return self.info