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DebuggerInitializationError kills the kernel #986
Description
When debugger fails to intialise, the kernel dies because DebuggerInitializationError does not get handled on import. See jupyterlab/jupyterlab#13069 for an example on how innocent code.py file might prevent user from launching the kernel.
Example traceback:
Traceback (most recent call last):
File "/3.9.5/lib/python3.9/runpy.py", line 197, in _run_module_as_main
return _run_code(code, main_globals, None,
File "/3.9.5/lib/python3.9/runpy.py", line 87, in _run_code
exec(code, run_globals)
File "/3.9.5/envs/ipython/lib/python3.9/site-packages/ipykernel_launcher.py", line 15, in <module>
from ipykernel import kernelapp as app
File "/3.9.5/envs/ipython/lib/python3.9/site-packages/ipykernel/kernelapp.py", line 51, in <module>
from .ipkernel import IPythonKernel
File "/3.9.5/envs/ipython/lib/python3.9/site-packages/ipykernel/ipkernel.py", line 19, in <module>
from .debugger import Debugger, _is_debugpy_available
File "/3.9.5/envs/ipython/lib/python3.9/site-packages/ipykernel/debugger.py", line 22, in <module>
from debugpy.server import api # noqa
File "/3.9.5/envs/ipython/lib/python3.9/site-packages/debugpy/server/__init__.py", line 7, in <module>
import debugpy._vendored.force_pydevd # noqa
File "/3.9.5/envs/ipython/lib/python3.9/site-packages/debugpy/_vendored/force_pydevd.py", line 28, in <module>
pydevd_constants = import_module('_pydevd_bundle.pydevd_constants')
File "/3.9.5/lib/python3.9/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "/3.9.5/envs/ipython/lib/python3.9/site-packages/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_constants.py", line 379, in <module>
from _pydev_bundle._pydev_saved_modules import thread, threading
File "/3.9.5/envs/ipython/lib/python3.9/site-packages/debugpy/_vendored/pydevd/_pydev_bundle/_pydev_saved_modules.py", line 91, in <module>
import code as _code; verify_shadowed.check(_code, ['compile_command', 'InteractiveInterpreter'])
File "/3.9.5/envs/ipython/lib/python3.9/site-packages/debugpy/_vendored/pydevd/_pydev_bundle/_pydev_saved_modules.py", line 75, in check
raise DebuggerInitializationError(msg)
_pydev_bundle._pydev_saved_modules.DebuggerInitializationError: It was not possible to initialize the debugger due to a module name conflict.
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