MINOR Reintroduced suppresswarnings annotations

SVN: 25536

base/sourceTest/java/ch/systemsx/cisd/base/convert/NativeDataTests.java

@@ -421,6 +421,7 @@ public class NativeDataTests
     {
     }
 
+    @SuppressWarnings("null")
     public static void main(String[] args) throws Throwable
     {
         System.out.println(BuildAndEnvironmentInfo.INSTANCE);