Do not import list patterns that have no parts

Author: akx

scripts/import_cldr.py

@@ -530,10 +530,11 @@ def parse_locale_display_names(data, tree):
 
 def parse_list_patterns(data, tree):
     list_patterns = data.setdefault('list_patterns', {})
-    for listType in tree.findall('.//listPatterns/listPattern'):
-        by_type = list_patterns.setdefault(listType.attrib.get('type', 'standard'), {})
-        for listPattern in listType.findall('listPatternPart'):
-            by_type[listPattern.attrib['type']] = _text(listPattern)
+    for list_pattern_el in tree.findall('.//listPatterns/listPattern'):
+        pattern_type = list_pattern_el.attrib.get('type', 'standard')
+        for pattern_part_el in list_pattern_el.findall('listPatternPart'):
+            pattern_part_type = pattern_part_el.attrib['type']
+            list_patterns.setdefault(pattern_type, {})[pattern_part_type] = _text(pattern_part_el)
 
 
 def parse_dates(data, tree, sup, regions, territory):