fix: add unit test and change log entry

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to the versioning scheme outlined in the [README.md](README.md).
 
+## [Unreleased]
+
+### Fixed
+
+- Handle the case where a bitcoin node returns zero headers (#3588)
+
 ## [2.1]
 
 This is a **consensus-breaking** release that introduces a _lot_ of new

src/burnchains/bitcoin/spv.rs

@@ -1832,4 +1832,24 @@ mod test {
 
         let deserialized: Vec<Vec<u8>> = deserialize(&encoded_tx).unwrap();
     }
+
+    #[test]
+    fn test_handle_headers_empty() {
+        let headers_path = "/tmp/test-spv-handle_headers_empty.dat";
+        if fs::metadata(headers_path).is_ok() {
+            fs::remove_file(headers_path).unwrap();
+        }
+
+        let mut spv_client = SpvClient::new(
+            headers_path,
+            0,
+            None,
+            BitcoinNetworkType::Regtest,
+            true,
+            false,
+        )
+        .unwrap();
+
+        spv_client.handle_headers(1, vec![]).unwrap();
+    }
 }