Revert "panic on Expected header frame"

This reverts commit 1f7de51.

iroh/src/client/blobs.rs

@@ -798,11 +798,7 @@ impl Reader {
         let (size, is_complete) = match stream.next().await {
             Some(Ok(BlobReadAtResponse::Entry { size, is_complete })) => (size, is_complete),
             Some(Err(err)) => return Err(err),
-            None | Some(Ok(_)) => {
-                println!("{}", std::backtrace::Backtrace::capture());
-                panic!("Expected header frame");
-                // return Err(anyhow!("Expected header frame"))
-            }
+            None | Some(Ok(_)) => return Err(anyhow!("Expected header frame")),
         };
 
         let stream = stream.map(|item| match item {