[openstreetmap/openstreetmap-website] Handle html error message for map xml export (PR #6284)

[Marwin Hochfelsner]

@hlfan commented on this pull request.



> @@ -52,7 +52,20 @@
         }
       };
     }
+
+    static getHtmlResponseHandler(event) {
+      const response = event.detail.fetchResponse.response;
+      const contentType = response.headers.get("content-type");
+
+      if (!response.ok && contentType?.includes("text/html")) {
+        // Prevent Turbo from replacing the current page with an error HTML response
+        // from the image export endpoint

```suggestion
        // from the export endpoint
```

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