[changed] isOpen function treats null or undefined prop as not being set

lib/Autocomplete.js

@@ -525,7 +525,8 @@ class Autocomplete extends React.Component {
   }
 
   isOpen() {
-    return 'open' in this.props ? this.props.open : this.state.isOpen
+    if ('open' in this.props && this.props.open !== undefined && this.props.open !== null) return this.props.open
+    else return this.state.isOpen
   }
 
   render() {

lib/__tests__/Autocomplete-test.js

@@ -148,7 +148,7 @@ describe('Autocomplete acceptance tests', () => {
     expect(tree.state('highlightedIndex')).toEqual(0)
   })
 
-  it('should display menu based on `props.open` when provided', () => {
+  it('should display menu based on `props.open` when provided with bool', () => {
     const tree = mount(AutocompleteComponentJSX({}))
     expect(tree.state('isOpen')).toBe(false)
     expect(tree.find('> div').length).toBe(0)
@@ -159,6 +159,12 @@ describe('Autocomplete acceptance tests', () => {
     expect(tree.find('> div').length).toBe(0)
     tree.setProps({ open: true })
     expect(tree.find('> div').length).toBe(1)
+    tree.setProps({ open: null })
+    tree.setState({ isOpen: false })
+    expect(tree.find('> div').length).toBe(0)
+    tree.setProps({ open: undefined })
+    tree.setState({ isOpen: false })
+    expect(tree.find('> div').length).toBe(0)
   })
 
   it('should set menu positions on initial render if the menu is visible', () => {