`PyCColorDialog.SetCustomColors` returns error without setting exception

[Avasam]

For all bugs, please provide the following information:

Expected behavior and actual behavior

Calling SetCustomColors should raise a descriptive exception, namely: TypeError: The argument must be a sequence of integers of length 1-16. But instead you get SystemError: error return without exception set.

pywin32/Pythonwin/win32dlg.cpp

Lines 1292 to 1309 in 8258348

	if (PyErr_Occurred() || len <= 0 || len > 16) {
	PyErr_Clear();
	PyErr_SetString(PyExc_TypeError, "The argument must be a sequence of integers of length 1-16");
	return NULL;
	}
	CColorDialog *pDlg = GetColorDialog(self);
	if (!pDlg)
	return NULL;
	for (int i = 0; i < len; i++) {
	PyObject *obInt = NULL;
	PyObject *ob = PySequence_GetItem(obCols, i);
	if (ob != NULL)
	obInt = PyNumber_Long(ob);
	if (obInt == NULL) {
	Py_XDECREF(ob);
	PyErr_SetString(PyExc_TypeError, "The argument must be a sequence of integers of length 1-16");
	return NULL;
	}

Steps to reproduce the problem

import win32ui
win32ui.CreateColorDialog(0, 0).SetCustomColors()  # SystemError: error return without exception set
win32ui.CreateColorDialog(0, 0).SetCustomColors([])  # SystemError: error return without exception set
win32ui.CreateColorDialog(0, 0).SetCustomColors([0])  # OK
win32ui.CreateColorDialog(0, 0).SetCustomColors((0,0))  # OK
win32ui.CreateColorDialog(0, 0).SetCustomColors((0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0))  # SystemError: error return without exception set

System information

Python version and distribution: 3.10.11

pywin32 version: 310

Windows Version: 10.0.19045 Build 19045

DLL locations: N/A