better error message if option that does not exists is in root optiondescription

tests/test_duplicate_config.py

@@ -4,9 +4,8 @@ do_autopath()
 from py.test import raises
 
 from tiramisu.setting import groups
-from tiramisu import Config, MetaConfig
-from tiramisu import ChoiceOption, BoolOption, IntOption, \
-    StrOption, OptionDescription
+from tiramisu import Config, MetaConfig, ChoiceOption, BoolOption, IntOption, \
+    StrOption, OptionDescription, groups
 from .test_state import _diff_opts, _diff_conf
 from tiramisu.storage import list_sessions
 
@@ -37,15 +36,12 @@ def make_description():
 
     leader = OptionDescription('ip_admin_eth0', '', [ip_admin_eth0, netmask_admin_eth0])
     interface1 = OptionDescription('interface1', '', [leader])
-    interface1.impl_set_group_type(groups.family)
 
     general = OptionDescription('general', '', [numero_etab, nom_machine,
                                 nombre_interfaces, activer_proxy_client,
                                 mode_conteneur_actif, mode_conteneur_actif2,
                                 adresse_serveur_ntp, time_zone, wantref_option])
-    general.impl_set_group_type(groups.family)
     new = OptionDescription('new', '', [], properties=('hidden',))
-    new.impl_set_group_type(groups.family)
     creole = OptionDescription('creole', 'first tiramisu configuration', [general, interface1, new])
     descr = OptionDescription('baseconfig', 'baseconifgdescr', [creole])
     return descr

tests/test_leadership.py

@@ -11,6 +11,9 @@ from tiramisu.error import LeadershipError, PropertiesOptionError, APIError, Con
 from tiramisu.storage import list_sessions
 
 
+groups.family = groups.GroupType('family')
+
+
 def teardown_function(function):
     assert list_sessions() == [], 'session list is not empty when leaving "{}"'.format(function.__name__)
 

tests/test_option.py

@@ -7,11 +7,13 @@ do_autopath()
 from py.test import raises
 
 from tiramisu.error import APIError, ConfigError
-from tiramisu import IntOption, SymLinkOption, OptionDescription, Config, Calculation
-from tiramisu.setting import groups
-from tiramisu.storage import list_sessions
+from tiramisu import IntOption, SymLinkOption, OptionDescription, Config, Calculation, groups, list_sessions
 from tiramisu.i18n import _
 
+try:
+    groups.family
+except:
+    groups.family = groups.GroupType('family')
 
 def teardown_function(function):
     assert list_sessions() == [], 'session list is not empty when leaving "{}"'.format(function.__name__)