mshtml: Handle S_FALSE from IUri methods in Anchor Elements.

dlls/mshtml/htmlanchor.c

@@ -517,6 +517,10 @@ static HRESULT WINAPI HTMLAnchorElement_get_port(IHTMLAnchorElement *iface, BSTR
     IUri_Release(uri);
     if(FAILED(hres))
         return hres;
+    if(hres != S_OK) {
+        *p = NULL;
+        return S_OK;
+    }
 
     len = swprintf(buf, ARRAY_SIZE(buf), L"%u", port);
     str = SysAllocStringLen(buf, len);
@@ -556,6 +560,11 @@ static HRESULT WINAPI HTMLAnchorElement_get_protocol(IHTMLAnchorElement *iface,
     IUri_Release(uri);
     if(FAILED(hres))
         return hres;
+    if(hres != S_OK) {
+        SysFreeString(scheme);
+        *p = NULL;
+        return S_OK;
+    }
 
     len = SysStringLen(scheme);
     if(len) {

dlls/mshtml/tests/dom.c

@@ -9479,6 +9479,12 @@ static void test_elems(IHTMLDocument2 *doc)
         test_anchor_hostname((IUnknown*)elem, L"test1");
         test_anchor_port((IUnknown*)elem, L"8080");
 
+        /* about:blank */
+        test_anchor_put_href((IUnknown*)elem, L"about:blank");
+        test_anchor_href((IUnknown*)elem, L"about:blank");
+        test_anchor_hostname((IUnknown*)elem, NULL);
+        test_anchor_port((IUnknown*)elem, NULL);
+
         /* Restore the href */
         test_anchor_put_href((IUnknown*)elem, L"http://test/");
         test_anchor_href((IUnknown*)elem, L"http://test/");