remove some try/except + consistency not works with submulti

test/test_option_validator.py

@@ -14,12 +14,12 @@ from tiramisu.i18n import _
 def return_true(value, param=None):
     if value == 'val' and param in [None, 'yes']:
         return True
-    raise ValueError('error')
+    return ValueError('error')
 
 
 def return_false(value, param=None):
     if value == 'val' and param in [None, 'yes']:
-        raise ValueError('error')
+        return ValueError('error')
 
 
 def return_val(value, param=None):
@@ -28,7 +28,7 @@ def return_val(value, param=None):
 
 def return_if_val(value):
     if value != 'val':
-        raise ValueError('error')
+        return ValueError('error')
 
 
 def test_validator():