QlArchARM object has no attribute unicorn_exception_handler during ARM Cortex-M emulation

Describe the bug
When attempting to emulate a bare-metal ARM program for Cortex-M using Qiling, the following error occurs: AttributeError: 'QlArchARM' object has no attribute 'unicorn_exception_handler'.

Sample Code

from qiling import Qiling
from qiling.const import *

ELF_FILE_PATH = "my-application.axf"
ROOT_FS_PATH = "./rootfs"

ql = Qiling([ELF_FILE_PATH], ROOT_FS_PATH, archtype=QL_ARCH.ARM, ostype=QL_OS.MCU, verbose=QL_VERBOSE.DEBUG)
ql.run()

Expected behavior
The Qiling emulator should successfully initialize and run the provided ARM Cortex-M ELF file without raising an AttributeError.

Screenshots
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Additional context

• Qiling version: 1.4.6
• Python version: 3.10.12
• Operating System: Ubuntu 22.04.4 LTS - x86_64
• Detailed error message: AttributeError: 'QlArchARM' object has no attribute 'unicorn_exception_handler'

Reproduce the failure with the provided Qiling(...) configuration for the ARM Cortex-M ELF, then start at ql.run() and trace ARM MCU initialization to the missing unicorn_exception_handler. Done means the sample initializes and runs without this AttributeError.