SONAR-11878 fix scanner behaviour on /batch/project timeout

sonar-scanner-engine/src/main/java/org/sonar/scanner/repository/DefaultProjectRepositoriesLoader.java

 import javax.annotation.Nullable;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.sonar.api.utils.MessageException;
 import org.sonar.scanner.bootstrap.ScannerWsClient;
 import org.sonar.scanner.util.ScannerUtils;
 import org.sonarqube.ws.Batch.WsProjectResponse;
 
   private static boolean shouldThrow(Exception e) {
     for (Throwable t : Throwables.getCausalChain(e)) {
-      if (t instanceof HttpException) {
-        HttpException http = (HttpException) t;
-        return http.code() != HttpURLConnection.HTTP_NOT_FOUND;
-      }
-      if (t instanceof MessageException) {
-        return true;
+      if (t instanceof HttpException && ((HttpException) t).code() == HttpURLConnection.HTTP_NOT_FOUND) {
+        return false;
       }
     }
 
-    return false;
+    return true;
   }
 
   private static ProjectRepositories processStream(InputStream is) throws IOException {

sonar-scanner-engine/src/test/java/org/sonar/scanner/repository/DefaultProjectRepositoriesLoaderTest.java

 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.net.HttpURLConnection;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyInt;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 
   }
 
   @Test
-  public void continueOnError() {
+  public void continueOnHttp404Exception() {
+    when(wsClient.call(any(WsRequest.class))).thenThrow(new HttpException("/batch/project.protobuf?key=foo%3F", HttpURLConnection.HTTP_NOT_FOUND, ""));
+    ProjectRepositories proj = loader.load(PROJECT_KEY, null);
+    assertThat(proj.exists()).isEqualTo(false);
+  }
+
+  @Test(expected = IllegalStateException.class)
+  public void failOnNonHttp404Exception() {
     when(wsClient.call(any(WsRequest.class))).thenThrow(IllegalStateException.class);
     ProjectRepositories proj = loader.load(PROJECT_KEY, null);
     assertThat(proj.exists()).isEqualTo(false);
   }
 
-  @Test
+  @Test(expected = IllegalStateException.class)
   public void parsingError() throws IOException {
     InputStream is = mock(InputStream.class);
-    when(is.read()).thenThrow(IOException.class);
+    when(is.read(any(byte[].class), anyInt(), anyInt())).thenThrow(IOException.class);
     WsTestUtil.mockStream(wsClient, "/batch/project.protobuf?key=foo%3F", is);
     loader.load(PROJECT_KEY, null);
   }