Avoid NullPointerException when the search response is null

indexer-core/src/main/java/org/opengroup/osdu/indexer/service/SearchServiceImpl.java

@@ -72,11 +72,15 @@ public class SearchServiceImpl implements SearchService {
                 .body(body)
                 .build();
         HttpResponse response = this.urlFetchService.sendRequest(request);
-        if(response.getResponseCode() == OK_CODE) {
+
+        if(response != null && response.getResponseCode() == OK_CODE) {
             return gson.fromJson(response.getBody(), SearchResponse.class);
         }
         else {
-            jaxRsDpsLog.error(String.format("Search service: failed to call the search service: %d", response.getResponseCode()));
+            if(response != null)
+                jaxRsDpsLog.error(String.format("Search service: failed to call the search service: %d", response.getResponseCode()));
+            else
+                jaxRsDpsLog.error(String.format("Search service: failed to call the search service. The response is null."));
             return new SearchResponse();
         }
     }

indexer-core/src/test/java/org/opengroup/osdu/indexer/service/SearchServiceImplTest.java

@@ -134,4 +134,13 @@ public class SearchServiceImplTest {
         Assert.assertNotNull(searchResponse);
         Assert.assertNull(searchResponse.getResults());
     }
+
+    @Test
+    public void query_with_null_response() throws URISyntaxException {
+        when(this.configurationProperties.getSearchHost()).thenReturn(searchHost);
+        when(this.urlFetchService.sendRequest(any())).thenReturn(null);
+        SearchResponse searchResponse = sut.query(new SearchRequest());
+        Assert.assertNotNull(searchResponse);
+        Assert.assertNull(searchResponse.getResults());
+    }
 }