[issue #2221] simplified configuration for @Singular-generated plural form nullchecks.

test/transform/resource/after-delombok/SuperBuilderBasic.java

@@ -26,7 +26,9 @@ public class SuperBuilderBasic {
 			}
 			@java.lang.SuppressWarnings("all")
 			public B items(final java.util.Collection<? extends String> items) {
-				if (items == null) throw new java.lang.NullPointerException("items cannot be null");
+				if (items == null) {
+					throw new java.lang.NullPointerException("items cannot be null");
+				}
 				if (this.items == null) this.items = new java.util.ArrayList<String>();
 				this.items.addAll(items);
 				return self();