[VERSION] Fix VerQueryValue when return Value is NULL. (reactos#7449)

CORE-19783
Co-authored-by: Timo Kreuzer <[email protected]>

Author: Doug-Lyons

dll/win32/version/version.c

@@ -979,6 +979,14 @@ static BOOL VersionInfo32_QueryValue( const VS_VERSION_INFO_STRUCT32 *info, LPCW
 
     /* Return value */
     *lplpBuffer = VersionInfo32_Value( info );
+
+#ifdef __REACTOS__
+    /* If the wValueLength is zero, then set a UNICODE_NULL only return string.
+     * Use the NULL terminator from the key string for that. This is what Windows does, too. */
+    if (!info->wValueLength)
+      *lplpBuffer = (PVOID)(info->szKey + wcslen(info->szKey));
+#endif
+
     if (puLen)
         *puLen = info->wValueLength;
     if (pbText)