mshtml: Return null from IHTMLStorage::getItem stub.

dlls/mshtml/htmlstorage.c

@@ -145,8 +145,11 @@ static HRESULT WINAPI HTMLStorage_key(IHTMLStorage *iface, LONG lIndex, BSTR *p)
 static HRESULT WINAPI HTMLStorage_getItem(IHTMLStorage *iface, BSTR bstrKey, VARIANT *p)
 {
     HTMLStorage *This = impl_from_IHTMLStorage(iface);
+
     FIXME("(%p)->(%s %p)\n", This, debugstr_w(bstrKey), p);
-    return E_NOTIMPL;
+
+    V_VT(p) = VT_NULL;
+    return S_OK;
 }
 
 static HRESULT WINAPI HTMLStorage_setItem(IHTMLStorage *iface, BSTR bstrKey, BSTR bstrValue)

dlls/mshtml/tests/dom.js

@@ -412,6 +412,9 @@ sync_test("storage", function() {
        "typeof(window.sessionStorage) = " + typeof(window.sessionStorage));
     ok(typeof(window.localStorage) === "object" || typeof(window.localStorage) === "unknown",
        "typeof(window.localStorage) = " + typeof(window.localStorage));
+
+    var item = sessionStorage.getItem("nonexisting");
+    ok(item === null, "item = " + item);
 });
 
 async_test("animation", function() {