fix(Dropdown): fix empty data entry handling

packages/dnb-eufemia/src/components/dropdown/__tests__/Dropdown.test.js

@@ -935,6 +935,21 @@ describe('Dropdown component', () => {
     ).toBe(title)
   })
 
+  it('should support empty data entry', () => {
+    const Comp = mount(<Component data={['']} />)
+
+    keydown(Comp, 32) // space
+
+    expect(
+      Comp.find('button').instance().getAttribute('aria-expanded')
+    ).toBe('true')
+    expect(
+      Comp.find('.dnb-drawer-list__option')
+        .find('.dnb-drawer-list__option__inner')
+        .instance().innerHTML
+    ).toBe('')
+  })
+
   it('has a correct value content if we send in a React component', () => {
     const aStringOf = 'Custom content 123'
     const Comp1 = mount(

packages/dnb-eufemia/src/fragments/drawer-list/DrawerList.js

@@ -564,7 +564,7 @@ const ItemContent = ({ hash, children }) => {
         {children.render ? children.render(item, hash + n) : item}
       </span>
     ))
-  } else if (children.content) {
+  } else if (Object.prototype.hasOwnProperty.call(children, 'content')) {
     return children.render
       ? children.render(children.content, hash, children)
       : children.content

packages/dnb-eufemia/src/fragments/drawer-list/DrawerListHelpers.js

@@ -284,7 +284,7 @@ export const normalizeData = (props) => {
       item = { content: item, __isTransformed: true }
     }
 
-    return typeof item.__id !== 'undefined' ? item : { ...item, __id }
+    return typeof item?.__id !== 'undefined' ? item : { ...item, __id }
   })
 }