Merge pull request #499 from mashmatrix/support-slds-2-fix-picklist-item-behaviors-with-no-value

Fix behaviors for `PicklistItem`s with no value for SLDS2

Author: stomita

src/scripts/Picklist.tsx

@@ -674,13 +674,17 @@ export const PicklistItem: FC<PicklistItemProps> = ({
     useContext(PicklistContext);
   const selected =
     selected_ ?? (value != null ? values.indexOf(value) >= 0 : false);
-  const isFocused = focusedValue === value;
+  const isFocused = value != null && focusedValue === value;
 
   const onClick = useEventCallback((e: React.SyntheticEvent) => {
-    if (!disabled && value != null) {
+    if (disabled) {
+      return;
+    }
+
+    if (value != null) {
       onSelect(value);
-      onClick_?.(e);
     }
+    onClick_?.(e);
   });
 
   const itemClassNames = classnames(