remove group constrainte, it's now a normal group

tests/dictionaries_old/10load_emptyvalue/00-base.xml

@@ -0,0 +1,13 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<rougail version="0.9">
+  <variables>
+    <family name="general">
+      <variable name="mode_conteneur_actif" type="string" description="No change">
+        <value/>
+      </variable>
+      <variable name="mode_conteneur_actif2" type="string" description="No change">
+        <value/>
+      </variable>
+    </family>
+  </variables>
+</rougail>

tests/dictionaries_old/10load_emptyvalue/makedict/after.json

@@ -0,0 +1,10 @@
+{
+    "rougail.general.mode_conteneur_actif": {
+        "owner": "default",
+        "value": null
+    },
+    "rougail.general.mode_conteneur_actif2": {
+        "owner": "default",
+        "value": null
+    }
+}

tests/dictionaries_old/10load_emptyvalue/makedict/base.json

@@ -0,0 +1,4 @@
+{
+    "rougail.general.mode_conteneur_actif": null,
+    "rougail.general.mode_conteneur_actif2": null
+}

tests/dictionaries_old/10load_emptyvalue/makedict/before.json

@@ -0,0 +1,10 @@
+{
+    "rougail.general.mode_conteneur_actif": {
+        "owner": "default",
+        "value": null
+    },
+    "rougail.general.mode_conteneur_actif2": {
+        "owner": "default",
+        "value": null
+    }
+}

tests/dictionaries_old/10load_emptyvalue/tiramisu/base.py

@@ -0,0 +1,18 @@
+from importlib.machinery import SourceFileLoader
+from importlib.util import spec_from_loader, module_from_spec
+loader = SourceFileLoader('func', 'tests/dictionaries/../eosfunc/test.py')
+spec = spec_from_loader(loader.name, loader)
+func = module_from_spec(spec)
+loader.exec_module(func)
+for key, value in dict(locals()).items():
+    if key != ['SourceFileLoader', 'func']:
+        setattr(func, key, value)
+try:
+    from tiramisu3 import *
+except:
+    from tiramisu import *
+option_3 = StrOption(name="mode_conteneur_actif", doc="No change", properties=frozenset({"normal"}))
+option_4 = StrOption(name="mode_conteneur_actif2", doc="No change", properties=frozenset({"normal"}))
+option_2 = OptionDescription(name="general", doc="general", children=[option_3, option_4], properties=frozenset({"normal"}))
+option_1 = OptionDescription(name="rougail", doc="rougail", children=[option_2])
+option_0 = OptionDescription(name="baseoption", doc="baseoption", children=[option_1])