Prevent invalid YAML config from bricking the UI

lib/local-cache.ts

@@ -365,7 +365,7 @@ async function fetchConfig(): Promise<[Config, UiConfig]> {
       let ref = ui;
       while (keys.length > 1) {
         const k = keys.shift();
-        if (typeof ref[k] !== "object") ref[k] = {};
+        if (ref[k] == null || typeof ref[k] !== "object") ref[k] = {};
         ref = ref[k];
       }
       ref[keys[0]] = val;

ui/components.ts

@@ -144,7 +144,14 @@ export function contextifyComponent(component: ComponentTypes): ComponentTypes {
             applyContext(res, context);
             return res;
           } catch (err) {
-            return m("p.error", { title: err.message }, "Error!");
+            return m(
+              "p.error",
+              {
+                title: "Click to print stack trace to console",
+                onclick: () => console.error(err),
+              },
+              "Error!"
+            );
           }
         };
         return state;

ui/config-functions.ts

@@ -45,7 +45,7 @@ export function flattenConfig(config: Record<string, unknown>): any {
 // Order keys such that nested objects come last
 function orderKeys(config: any): number {
   let res = 1;
-  if (typeof config !== "object") return res;
+  if (config == null || typeof config !== "object") return res;
   if (Array.isArray(config)) {
     for (const c of config) res += orderKeys(c);
     return res;
@@ -79,7 +79,7 @@ export function structureConfig(config: Config[]): any {
     let ref = _config;
     while (keys.length > 1) {
       const k = keys.shift();
-      if (typeof ref[k] !== "object") ref[k] = {};
+      if (ref[k] == null || typeof ref[k] !== "object") ref[k] = {};
       ref = ref[k];
     }
     ref[keys[0]] = c.value;
@@ -137,7 +137,7 @@ export function diffConfig(
   };
 
   for (const [k, v] of Object.entries(target))
-    if (!current[k] || current[k] !== v) diff.add.push({ _id: k, value: v });
+    if (v && current[k] !== v) diff.add.push({ _id: k, value: v });
 
   for (const k of Object.keys(current)) if (!target[k]) diff.remove.push(k);