Wrap buildCurrent in try in case of unknown errors + verify no need to be async.

ui/widgets/connector.vue

@@ -257,19 +257,20 @@ export default {
       this.$emit("cancel", true);
     },
     cancel() {
+      if (this.working) {
+        return;
+      }
+
       if (this.cancelled) {
         return;
       }
 
       this.cancelled = true;
 
-      if (this.working) {
-        return;
-      }
-
       this.sendCancel();
     },
     buildCurrent(next) {
+      try {
         this.current = buildEmptyCurrent();
 
         this.working = this.getConnector().wizard.started();
@@ -318,6 +319,15 @@ export default {
         }
 
         return next;
+      } catch (e) {
+        this.current.title = "Encountered an error";
+        this.current.message = e;
+
+        this.working = false;
+        this.disabled = true;
+
+        throw e;
+      }
     },
     getConnector() {
       if (this.currentConnector === null) {
@@ -377,9 +387,9 @@ export default {
       event.target.style.height = "";
       event.target.style.height = event.target.scrollHeight + "px";
     },
-    async verify(key, field, force) {
+    verify(key, field, force) {
       try {
-        field.message = "" + (await field.field.verify(field.field.value));
+        field.message = "" + field.field.verify(field.field.value);
         field.inputted = true;
         field.verified = true;
         field.error = "";