Speaking from experience, I'd always say it's better to show a few key projects than nothing at all.
From a clients point of view they need at least a little bit of proof that you can design. Why would they risk hiring somebody who seems to have no track record of working on any projects?
Your number one goal at the minute seems to be getting some more projects. Sure, if your portfolio isn't high quality you're probably not going to attract high quality clients, but if you view every project you get as THE project - you can turn a low budget, crappy brief into a fantastic case study that'll set the bar for future projects!