Avoid creating broken links.

nikola/plugins/task/authors.py

@@ -142,7 +142,7 @@ def provide_context_and_uptodate(self, classification, lang, node=None):
 
     def get_other_language_variants(self, classification, lang, classifications_per_language):
         """Return a list of variants of the same author in other languages."""
-        return self.translation_manager.get_translations_as_list(classification, lang)
+        return self.translation_manager.get_translations_as_list(classification, lang, classifications_per_language)
 
     def postprocess_posts_per_classification(self, posts_per_classification_per_language, flat_hierarchy_per_lang=None, hierarchy_lookup_per_lang=None):
         """Rearrange, modify or otherwise use the list of posts per classification and per language."""

nikola/plugins/task/categories.py

@@ -193,7 +193,7 @@ def provide_context_and_uptodate(self, classification, lang, node=None):
 
     def get_other_language_variants(self, classification, lang, classifications_per_language):
         """Return a list of variants of the same category in other languages."""
-        return self.translation_manager.get_translations_as_list(classification, lang)
+        return self.translation_manager.get_translations_as_list(classification, lang, classifications_per_language)
 
     def postprocess_posts_per_classification(self, posts_per_classification_per_language, flat_hierarchy_per_lang=None, hierarchy_lookup_per_lang=None):
         """Rearrange, modify or otherwise use the list of posts per classification and per language."""

nikola/plugins/task/sections.py

@@ -157,4 +157,4 @@ def should_generate_classification_page(self, classification, post_list, lang):
 
     def get_other_language_variants(self, classification, lang, classifications_per_language):
         """Return a list of variants of the same section in other languages."""
-        return self.translation_manager.get_translations_as_list(classification, lang)
+        return self.translation_manager.get_translations_as_list(classification, lang, classifications_per_language)

nikola/plugins/task/tags.py

@@ -161,7 +161,7 @@ def provide_context_and_uptodate(self, classification, lang, node=None):
 
     def get_other_language_variants(self, classification, lang, classifications_per_language):
         """Return a list of variants of the same tag in other languages."""
-        return self.translation_manager.get_translations_as_list(classification, lang)
+        return self.translation_manager.get_translations_as_list(classification, lang, classifications_per_language)
 
     def postprocess_posts_per_classification(self, posts_per_classification_per_language, flat_hierarchy_per_lang=None, hierarchy_lookup_per_lang=None):
         """Rearrange, modify or otherwise use the list of posts per classification and per language."""

nikola/utils.py

@@ -2002,16 +2002,21 @@ def get_translations(self, classification, lang):
         else:
             return {other_lang: list(classifications) for other_lang, classifications in cldata.items()}
 
-    def get_translations_as_list(self, classification, lang):
-        """Get a list of pairs ``(other_lang, other_classification)`` which are translations of ``classification``."""
+    def get_translations_as_list(self, classification, lang, classifications_per_language):
+        """Get a list of pairs ``(other_lang, other_classification)`` which are translations of ``classification``.
+
+        Avoid classifications not in ``classifications_per_language``.
+        """
         clmap = self._data[lang]
         cldata = clmap.get(classification)
         if cldata is None:
             return []
         else:
             result = []
             for other_lang, classifications in cldata.items():
-                result.extend([(other_lang, other_classification) for other_classification in classifications])
+                for other_classification in classifications:
+                    if other_classification in classifications_per_language[other_lang]:
+                        result.append((other_lang, other_classification))
             return result
 
     def has_translations(self, classification, lang):