/ini=nul got broken by 1f21f57f30

(cherry picked from commit 39f760159193fd391db5fe3e9d3e45d1c6eedb63)

Source commit: 19107c10a0c48ab653b8938db93a0615622fcb67

source/windows/WinMain.cpp

@@ -815,7 +815,7 @@ int __fastcall Execute()
     HintWindowClass = __classid(TScreenTipHintWindow);
 
     UnicodeString IniFileName = Params->SwitchValue(INI_SWITCH);
-    if (!IniFileName.IsEmpty())
+    if (!IniFileName.IsEmpty() && (IniFileName != INI_NUL))
     {
       UnicodeString IniFileNameExpanded = ExpandEnvironmentVariables(IniFileName);
       if (!FileExists(ApiPath(IniFileNameExpanded)))