Turned message into a warning rather than an exception

conversion_utils/jos_msds_and_properties.py

@@ -254,8 +254,13 @@ class Converter:
                 exit('Could not parse specifications xml file provided.')
 
     def msd_to_properties(self, msd, language, lemma=None):
-        """Convert Msd to Properties (possibly in the other language)."""
- 
+        """Convert Msd to Properties (possibly in the other language).
+
+        The level (lexeme vs form) of certain reflexive msd features
+        depends on the lemma, so set the lemma if you need accurate
+        level information.
+        """
+
         if (msd.code not in self.specifications.codes_map[msd.language]):
             raise ConverterException('The msd {} is unknown'.format(msd.code))
 
@@ -273,8 +278,8 @@ class Converter:
                 feature_name = feature.names.get(language)
                 feature_value = value.names.get(language)
                 if (lemma is None and (category_name, index) in [(le[0], le[1]) for le in LEVEL_EXCEPTIONS]):
-                    raise ConverterException('The lemma is None but feature level depends on lemma for category={category}, position={position}'\
-                                             .format(category=category_name, position=index))
+                    print('[WARN] The level of feature (category={category}, position={position}) may be incorrect, as it is lemma-specific and no lemma has been specified.'
+                          .format(category=category_name, position=index))
                 level_exception_flag = (category_name, feature.position, lemma) in LEVEL_EXCEPTIONS
                 lexeme_level_flag = feature.lexeme_level_flag if not level_exception_flag else not feature.lexeme_level_flag
                 feature_value_list.append((feature, value))