Apply suggestions from code review of branch refactor/migrate_vuex_to_pinia

Co-authored-by: Julian Stirling <julian@julianstirling.co.uk>

webapp/src/components/labThingsComponents/propertyControl.vue

@@ -68,7 +68,9 @@ export default {
   computed: {
     propertyDescription: function () {
       const td = this.wotStore.thingDescriptions[this.thingName];
+      // Return `undefined` if the thing doesn't exist or has no properties
       if (!td || !td.properties) return undefined;
+      // JS returns `undefined` if this property name doesn't exist
       return td.properties[this.propertyName];
     },
   },

webapp/src/components/tabContentComponents/controlComponents/stageControlButtons.vue

@@ -104,8 +104,6 @@ export default {
     ...mapWritableState(useSettingsStore, ["navigationInvert"]),
   },
 
-  // TODO: jogInterval may need to be cleared on "beforeUnmount()"
-
   methods: {
     /**
      * Jog d-pad and focus buttons.

webapp/src/components/tabContentComponents/powerContent.vue

@@ -66,10 +66,10 @@ export default {
       }
       this.modalConfirm(message).then(
         () => {
-          this.resetState();
-          this.deleteAllThingDescriptions();
           // Post and silence errors
           axios.post(this.thingActionUrl("system", action)).catch(() => {});
+          this.resetState();
+          this.deleteAllThingDescriptions();
         },
         () => {},
       );

webapp/src/components/tabContentComponents/slideScanComponents/slideScanControls.vue

@@ -42,8 +42,6 @@
 import propertyControl from "@/components/labThingsComponents/propertyControl.vue";
 import ServerSpecifiedInterface from "@/components/labThingsComponents/serverSpecifiedInterface.vue";
 import { useIntersectionObserver } from "@vueuse/core";
-//import { mapWritableState } from "pinia";
-//import { useSettingsStore } from "@/stores/settings.js";
 
 export default {
   name: "SlideScanControls",