Fix Feference field to work with non-relational value

The refactoring of changeset 0e4702844572 removed the management of
non-relational value for Reference fields.

tryton/gui/window/view_form/model/field.py

@@ -779,11 +779,13 @@ class ReferenceField(CharField):
         return None
 
     def set_client(self, record, value, force_change=False):
-        ref_model, ref_id = value
-        if isinstance(ref_id, (tuple, list)):
-            ref_id, rec_name = ref_id
-            record.value[self.name + '.rec_name'] = rec_name
-        super(ReferenceField, self).set_client(record, (ref_model, ref_id),
+        if value:
+            ref_model, ref_id = value
+            if isinstance(ref_id, (tuple, list)):
+                ref_id, rec_name = ref_id
+                record.value[self.name + '.rec_name'] = rec_name
+            value = (ref_model, ref_id)
+        super(ReferenceField, self).set_client(record, value,
             force_change=force_change)
 
     def set(self, record, value, modified=False):
@@ -795,7 +797,10 @@ class ReferenceField(CharField):
             if not ref_id:
                 ref_id = None
             else:
-                ref_id = int(ref_id)
+                try:
+                    ref_id = int(ref_id)
+                except ValueError:
+                    pass
         else:
             ref_model, ref_id = value
         rec_name = record.value.get(self.name + '.rec_name') or ''
@@ -811,7 +816,7 @@ class ReferenceField(CharField):
                         return
                 rec_name = result['rec_name']
         else:
-            rec_name = ''
+            rec_name = ref_id
         record.value[self.name] = ref_model, ref_id
         record.value[self.name + '.rec_name'] = rec_name
         if modified:

tryton/gui/window/view_form/view/form_gtk/reference.py

@@ -82,8 +82,8 @@ class Reference(Many2One):
         if self.record and self.field:
             try:
                 model, name = self.field.get_client(self.record)
-            except ValueError:
-                model, name = None
+            except (ValueError, TypeError):
+                model, name = '', ''
             return (model != self.get_model()
                 or name != self.wid_text.get_text())
         return False
@@ -95,7 +95,10 @@ class Reference(Many2One):
         if not value:
             value = None
         else:
-            value = int(value)
+            try:
+                value = int(value)
+            except ValueError:
+                value = None
         result = model == self.get_model() and value >= 0
         return result
 
@@ -116,8 +119,17 @@ class Reference(Many2One):
         self.wid_text.set_position(0)
         self.field.set_client(self.record, (self.get_model(), (-1, '')))
 
+    def set_value(self, record, field):
+        if not self.get_model():
+            value = self.wid_text.get_text()
+            return field.set_client(record, ('', value))
+        return super(Reference, self).set_value(record, field)
+
     def set_text(self, value):
-        model, value = value
+        if value:
+            model, value = value
+        else:
+            model, value = None, None
         super(Reference, self).set_text(value)
         child = self.widget_combo.get_child()
         if model: