As long as you oxygenated, pitched plenty of healty yeast, and keep it at 50F there should be no need for a D-rest. I never do D-rests on my lagers. I pitch at 46-48F. Let it free rise to 50-52F, depending on my mood. Then let it ferment at that temp for 3-4 weeks. I am crazy sensitive to diacetyl, so I would know if it is in there. That being said, I have never used 2278. At 2 weeks into a lager fermentation, you would still be ok to do a D-rest when you get home.