Get rid of 'empty control-flow statement' warning

Change-Id: Icf40d98ba354bfa0a0e496e2493a82b7c301a9dd
diff --git a/src/main/java/com/googlesource/gerrit/plugins/importer/HttpResponse.java b/src/main/java/com/googlesource/gerrit/plugins/importer/HttpResponse.java
index 34786d3..4966c3c 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/importer/HttpResponse.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/importer/HttpResponse.java
@@ -46,7 +46,9 @@
     try {
       Reader reader = getReader();
       if (reader != null) {
-        while (reader.read() != -1);
+        while (reader.read() != -1) {
+          // Empty
+        }
       }
     } finally {
       response.close();