public static <T, U> BiConsumer<T, U> ifNull(BiConsumer<T, U> c) {
		return c == null ? biConsumer() : c;
	}
Returns the given consumer object if it is not {@code null}.  Otherwise, a 
{@link #biConsumer()} is returned.  This is useful to avoid using {@code null}.

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