ref(logging): add error logging for SampleResult with no response data

Signed-off-by: Johnny Hujol <itudoben@users.noreply.github.com>

Author: itudoben

src/main/java/io/github/delirius325/jmeter/backendlistener/elasticsearch/ElasticsearchBackendClient.java

@@ -272,6 +272,24 @@ public void handleSampleResults(List<SampleResult> results, BackendListenerConte
     final String filtersAsString = (this.filters.isEmpty()) ? "no filters" : String.join(", ", this.filters);
     for (SampleResult sr : results) {
       String respString = sr.getResponseDataAsString();
+      if (sr.getBytesAsLong() == 0 || respString == null) {
+        logger.error("SampleResult has no response data. Details: label={}, success={}, responseCode={}, responseMessage={}, " +
+            "startTime={}, endTime={}, threadName={}, bytes={}, dataType={}, samplerData={}, requestHeaders={}, responseHeaders={}",
+          sr.getSampleLabel(),
+          sr.isSuccessful(),
+          sr.getResponseCode(),
+          sr.getResponseMessage(),
+          sr.getStartTime(),
+          sr.getEndTime(),
+          sr.getThreadName(),
+          sr.getBytesAsLong(),
+          sr.getDataType(),
+          sr.getSamplerData(),
+          sr.getRequestHeaders(),
+          sr.getResponseHeaders());
+        throw new IllegalStateException("SampleResult has no response data for label: " + sr.getSampleLabel());
+      }
+
       int endIndex = Math.min(100, respString.length());
       respString = respString.substring(0, endIndex);
       logger.info("Handle sampler result ({}) {}: {}", endIndex, sr.getSampleLabel(), respString);