(warc) Fix NPE in WarcRecorder

code/processes/crawling-process/src/main/java/nu/marginalia/crawl/retreival/fetcher/warc/WarcRecorder.java

@@ -203,7 +203,14 @@ public class WarcRecorder implements AutoCloseable {
             WarcDigestBuilder responseDigestBuilder = new WarcDigestBuilder();
             WarcDigestBuilder payloadDigestBuilder = new WarcDigestBuilder();
 
-            byte[] bytes = documentBody.getBytes();
+            byte[] bytes;
+
+            if (documentBody == null) {
+                bytes = new byte[0];
+            }
+            else {
+                bytes = documentBody.getBytes();
+            }
 
             String fakeHeaders = STR."""
                     Content-Type: \{contentType}

code/processes/crawling-process/src/test/java/nu/marginalia/crawl/retreival/fetcher/WarcRecorderTest.java

@@ -91,6 +91,18 @@ class WarcRecorderTest {
         }
     }
 
+    @Test
+    public void flagAsSkippedNullBody() throws IOException, URISyntaxException {
+
+        try (var recorder = new WarcRecorder(fileNameWarc)) {
+            recorder.flagAsSkipped(new EdgeUrl("https://www.marginalia.nu/"),
+                    "text/html",
+                    200,
+                    null);
+        }
+
+    }
+
     @Test
     public void testSaveImport() throws URISyntaxException, IOException {
         try (var recorder = new WarcRecorder(fileNameWarc)) {