fix: throwing error when settings key being empty - fixed #1409

pages/settings.vue

@@ -265,14 +265,14 @@ export default {
       setTimeout(() => (target.innerHTML = '<i class="material-icons">clear_all</i>'), 1000)
     },
     syncCollections() {
-      if (fb.currentUser !== null) {
+      if (fb.currentUser !== null && fb.currentSettings[0]) {
         if (fb.currentSettings[0].value) {
           fb.writeCollections(JSON.parse(JSON.stringify(this.$store.state.postwoman.collections)))
         }
       }
     },
     syncEnvironments() {
-      if (fb.currentUser !== null) {
+      if (fb.currentUser !== null && fb.currentSettings[1]) {
         if (fb.currentSettings[1].value) {
           fb.writeEnvironments(JSON.parse(JSON.stringify(this.$store.state.postwoman.environments)))
         }