public static Runnable ifNull(Runnable r) {
		return r == null ? runnable() : r;
	}
Returns the given runnable object if it is not {@code null}.  Otherwise, a {@link #runnable()}
is returned.  This is useful to avoid using {@code null}.

@param r the runnable function to check for {@code null}
@return a non-null runnable
Ghidra/Framework/Utility/src/main/java/utility/function/Dummy.java