fix: skip documents with no template attribute

blogue/build.py

@@ -48,6 +48,12 @@ def build_site(
             current_document.source_locator.stem + ".html"
         )
 
+        if "template" not in current_metadata:
+            logger.warning(
+                f"Skipped {current_document.source_locator.name}, no template attribute."
+            )
+            continue
+
         with open(target_path, "w") as out:
             rendered = renderer.render(
                 str(current_metadata["template"]),