Handle Wikipedia category API failures

main.py

@@ -354,6 +354,7 @@ class CategoryResult:
 
     articles: list[ArticleWithoutImage]
     gcmcontinue: str | None
+    error: str | None = None
 
 
 # Common non-content images to ignore when checking if an article has images
@@ -435,6 +436,7 @@ def get_articles_without_images(
     articles_without_images: list[ArticleWithoutImage] = []
     seen_pageids: set[int] = set()
     next_gcmcontinue: str | None = None
+    error: str | None = None
 
     # Build initial continue params from the external pagination token
     continue_params: dict[str, str] = {}
@@ -451,8 +453,20 @@ def get_articles_without_images(
             )
             response.raise_for_status()
             data = response.json()
+            if api_error := data.get("error"):
+                raise requests.RequestException(
+                    f"{api_error.get('code', 'unknown')}: "
+                    f"{api_error.get('info', 'unknown Wikipedia API error')}"
+                )
         except (requests.RequestException, json.JSONDecodeError) as e:
             print(f"Wikipedia API error: {e}")
+            if articles_without_images:
+                error = (
+                    "Wikipedia stopped responding before the whole category could "
+                    "be checked. Showing partial results; please try again."
+                )
+            else:
+                error = "Unable to load articles from Wikipedia. Please try again."
             break
 
         pages = data.get("query", {}).get("pages", {})
@@ -491,6 +505,7 @@ def get_articles_without_images(
     return CategoryResult(
         articles=articles_without_images,
         gcmcontinue=next_gcmcontinue,
+        error=error,
     )
 
 
@@ -891,6 +906,7 @@ def category_search() -> str:
         category_name=category_name,
         articles=result.articles,
         gcmcontinue=result.gcmcontinue,
+        error=result.error,
     )