fixed not building when no relevant page has ever existed

fgs/generator.py

@@ -79,9 +79,9 @@ class Generator:
         relevant_pages_tuple.sort(key=lambda x: x[0])
         relevant_pages_tuple.reverse()
         relevant_pages = {}
+        for lang in self.config['lang']['supported']:
+            relevant_pages[lang] = []
         for prio, page in relevant_pages_tuple:
-            if page.lang not in relevant_pages:
-                relevant_pages[page.lang] = []
             relevant_pages[page.lang].append(page)
         self.context['relevant_pages'] = relevant_pages
         self.context['relevant_pages_tuple'] = relevant_pages_tuple