Change the async stuff to not render app before theme is loaded

src/boot/after_store.js

@@ -55,7 +55,6 @@ const afterStoreSetup = ({ store, i18n }) => {
           }
 
           copyInstanceOption('nsfwCensorImage')
-          copyInstanceOption('theme')
           copyInstanceOption('background')
           copyInstanceOption('hidePostStats')
           copyInstanceOption('hideUserStats')
@@ -93,6 +92,9 @@ const afterStoreSetup = ({ store, i18n }) => {
             store.dispatch('initializeSocket')
           }
 
+          return store.dispatch('setTheme', config['theme'])
+        })
+        .then(() => {
           const router = new VueRouter({
             mode: 'history',
             routes: routes(store),

src/lib/persisted_state.js

@@ -48,7 +48,7 @@ export default function createPersistedState ({
   return getState(key, storage).then((savedState) => {
     return store => {
       try {
-        if (typeof savedState === 'object') {
+        if (savedState !== null && typeof savedState === 'object') {
           // build user cache
           const usersState = savedState.users || {}
           usersState.usersObject = {}

src/modules/instance.js

@@ -63,9 +63,11 @@ const instance = {
         case 'name':
           dispatch('setPageTitle')
           break
-        case 'theme':
-          setPreset(value, commit)
       }
+    },
+    setTheme ({ commit }, themeName) {
+      commit('setInstanceOption', { name: 'theme', value: themeName })
+      return setPreset(themeName, commit)
     }
   }
 }

src/services/style_setter/style_setter.js

@@ -480,7 +480,7 @@ const getThemes = () => {
 }
 
 const setPreset = (val, commit) => {
-  getThemes().then((themes) => {
+  return getThemes().then((themes) => {
     const theme = themes[val] ? themes[val] : themes['pleroma-dark']
     const isV1 = Array.isArray(theme)
     const data = isV1 ? {} : theme.theme