windowscodecs: Report missing component info strings as zero-length.

dlls/windowscodecs/info.c

@@ -59,6 +59,12 @@ static HRESULT ComponentInfo_GetStringValue(HKEY classkey, LPCWSTR value,
     ret = RegGetValueW(classkey, NULL, value, RRF_RT_REG_SZ|RRF_NOEXPAND, NULL,
         buffer, &cbdata);
 
+    if (ret == ERROR_FILE_NOT_FOUND)
+    {
+        *actual_size = 0;
+        return S_OK;
+    }
+
     if (ret == 0 || ret == ERROR_MORE_DATA)
         *actual_size = cbdata/sizeof(WCHAR);
 

dlls/windowscodecs/tests/info.c

@@ -214,8 +214,8 @@ static void test_pixelformat_info(void)
 
     len = 0xdeadbeef;
     hr = IWICComponentInfo_GetVersion(info, 0, NULL, &len);
-    todo_wine ok(hr == S_OK, "GetVersion failed, hr=%x\n", hr);
-    todo_wine ok(len == 0, "invalid length 0x%x\n", len); /* version does not apply to pixel formats */
+    ok(hr == S_OK, "GetVersion failed, hr=%x\n", hr);
+    ok(len == 0, "invalid length 0x%x\n", len); /* version does not apply to pixel formats */
 
     IWICComponentInfo_Release(info);
 }