Allow empty lambdas to not have whitespace

[mccheah]

What happened?

The following code produces an error in checkstyle:

args.forEach(arg -> {});

Checkstyle will complain and ask for this:

args.forEach(arg -> { });

What did you want to happen?

It seems reasonable for empty lambdas to not have any whitespace. This is similar to empty method bodies in private constructors, for example.

[schlosna]

@mccheah do you have a more realistic example? It feels like any no-op like this (forEach, Runnable) etc. is a bit odd as you’re just burning CPU cycles.

[carterkozak]

This comes to mind, though it doesn't come up frequently: https://github.com/palantir/tracing-java/blob/develop/tracing/src/main/java/com/palantir/tracing/Tracer.java#L268

[mccheah]

The issue linked above in Iceberg shows where we're concerned: apache/iceberg#153 (comment)

[iamdanfox]

Fixed here #715

baseline 1.8.0