Title may be omitted (#7865)
Title may be omitted (#7865)

Fixes https://github.com/zeit/next.js/issues/7854
JeromeFitz/next.js,JeromeFitz/next.js,zeit/next.js,JeromeFitz/next.js,azukaru/next.js,azukaru/next.js,flybayer/next.js,BlancheXu/test,BlancheXu/test,flybayer/next.js,azukaru/next.js,flybayer/next.js,azukaru/next.js,zeit/next.js,JeromeFitz/next.js,BlancheXu/test,zeit/next.js,flybayer/next.js