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

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

@@ -50,7 +50,9 @@ class BuilderWithToBuilder<T> {
 		}
 		@java.lang.SuppressWarnings("all")
 		public BuilderWithToBuilder.BuilderWithToBuilderBuilder<T> bars(final java.util.Collection<? extends T> bars) {
-			if (bars == null) throw new java.lang.NullPointerException("bars cannot be null");
+			if (bars == null) {
+				throw new java.lang.NullPointerException("bars cannot be null");
+			}
 			if (this.bars == null) this.bars = new java.util.ArrayList<T>();
 			this.bars.addAll(bars);
 			return this;