chore: check for null values and attributes

Author: rubencarvalho

1st-gen/packages/picker/src/Picker.ts

@@ -867,7 +867,8 @@ export class PickerBase extends SizedMixin(SpectrumElement, {
             // Only clear value when items exist with real values but none match.
             // Preserve value if items are pending (lazy loaded, async render, incomplete upgrade).
             const hasItemsWithValues = this.menuItems.some(
-                (item) => item.value && item.value.trim() !== ''
+                (item) =>
+                    item.value != null || item.getAttribute?.('value') != null
             );
             if (this.menuItems.length > 0 && hasItemsWithValues) {
                 this.value = '';