fix(ssr): expose context.styles when no lifecycle styles are injected
fix(ssr): expose context.styles when no lifecycle styles are injected

fix #6353

Kingwl/vue,Ddder-FE/vue,cnchanning/vue,optimizely/vue,Kingwl/vue,Jinjiang/vue,KingMario/vue,vuejs/vue,Ddder-FE/vue,Ddder-FE/vue,cnchanning/vue,vuejs/vue,lizhiyao/vue,Jinjiang/vue,lizhiyao/vue,vuejs/vue,Jinjiang/vue,Kingwl/vue,lizhiyao/vue,lizhiyao/vue,Hanks10100/vue,Ddder-FE/vue,KingMario/vue,cnchanning/vue,KingMario/vue,Hanks10100/vue,KingMario/vue,Kingwl/vue,vuejs/vue,Hanks10100/vue,Jinjiang/vue,Hanks10100/vue