IntegerVectorsModPermutationGroup crashes on empty domain #36681
Description
Steps To Reproduce
In SageMath version 9.0, Release Date: 2020-01-01, run the following:
sage: P=PermutationGroup([],domain=[])
sage: V=IntegerVectorsModPermutationGroup(P, sum=1)
sage: V.cardinality()
Expected Behavior
The cardinality should be zero.
The domain is empty, so we are counting empty integer vectors whose sum is 1. There are no such vectors.
Actual Behavior
SageMath crashes with the following dump.
------------------------------------------------------------------------
/usr/lib/python3/dist-packages/cysignals/signals.cpython-38-x86_64-linux-gnu.so(+0x8154)[0x7ff63a15a154]
/usr/lib/python3/dist-packages/cysignals/signals.cpython-38-x86_64-linux-gnu.so(+0x8329)[0x7ff63a15a329]
/usr/lib/python3/dist-packages/cysignals/signals.cpython-38-x86_64-linux-gnu.so(+0xad5f)[0x7ff63a15cd5f]
/lib/x86_64-linux-gnu/libc.so.6(+0x43090)[0x7ff63d26a090]
/usr/lib/python3/dist-packages/sage/combinat/enumeration_mod_permgroup.cpython-38-x86_64-linux-gnu.so(+0x6ffb)[0x7ff51eb7effb]
/usr/lib/python3/dist-packages/sage/combinat/enumeration_mod_permgroup.cpython-38-x86_64-linux-gnu.so(+0x884b)[0x7ff51eb8084b]
/usr/lib/python3/dist-packages/sage/combinat/enumeration_mod_permgroup.cpython-38-x86_64-linux-gnu.so(+0xcb2d)[0x7ff51eb84b2d]
python3(PyCFunction_Call+0x59)[0x5f6939]
python3(_PyObject_MakeTpCall+0x296)[0x5f7506]
python3(_PyEval_EvalFrameDefault+0x59c7)[0x570787]
python3[0x50b07e]
python3(_PyEval_EvalFrameDefault+0x5796)[0x570556]
python3[0x500e63]
python3(_PyEval_EvalFrameDefault+0xafd)[0x56b8bd]
python3(_PyEval_EvalCodeWithName+0x26a)[0x5697da]
python3[0x50b1f0]
python3(_PyEval_EvalFrameDefault+0x5796)[0x570556]
python3(_PyEval_EvalCodeWithName+0x26a)[0x5697da]
python3(PyEval_EvalCode+0x27)[0x68e547]
python3[0x601624]
python3[0x5c4ef0]
python3(_PyEval_EvalFrameDefault+0x72d)[0x56b4ed]
python3[0x5009c8]
python3(_PyEval_EvalFrameDefault+0x213d)[0x56cefd]
python3[0x5009c8]
python3(_PyEval_EvalFrameDefault+0x213d)[0x56cefd]
python3[0x5009c8]
python3[0x504716]
python3(_PyEval_EvalFrameDefault+0x859)[0x56b619]
python3(_PyFunction_Vectorcall+0x1b6)[0x5f6ce6]
python3(_PyEval_EvalFrameDefault+0x72d)[0x56b4ed]
python3(_PyFunction_Vectorcall+0x1b6)[0x5f6ce6]
python3(_PyEval_EvalFrameDefault+0x859)[0x56b619]
python3(_PyEval_EvalCodeWithName+0x26a)[0x5697da]
python3[0x50b1f0]
python3(_PyEval_EvalFrameDefault+0x1910)[0x56c6d0]
python3(_PyEval_EvalCodeWithName+0x26a)[0x5697da]
python3(_PyFunction_Vectorcall+0x393)[0x5f6ec3]
python3(_PyEval_EvalFrameDefault+0x859)[0x56b619]
python3(_PyEval_EvalCodeWithName+0x26a)[0x5697da]
python3(_PyFunction_Vectorcall+0x393)[0x5f6ec3]
python3(_PyEval_EvalFrameDefault+0x859)[0x56b619]
python3(_PyFunction_Vectorcall+0x1b6)[0x5f6ce6]
python3(_PyEval_EvalFrameDefault+0x859)[0x56b619]
python3(_PyEval_EvalCodeWithName+0x26a)[0x5697da]
python3(PyEval_EvalCode+0x27)[0x68e547]
python3[0x67dbf1]
python3[0x67dc6f]
python3[0x67dd11]
python3(PyRun_SimpleFileExFlags+0x197)[0x67fe37]
python3(Py_RunMain+0x212)[0x6b7c82]
python3(Py_BytesMain+0x2d)[0x6b800d]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0x7ff63d24b083]
python3(_start+0x2e)[0x5fb85e]
------------------------------------------------------------------------
Additional Information
No response
Environment
- **OS**: Ubuntu 20.05
- **Sage Version**: 9.0, Release Date: 2020-01-01
Also tested on Sage 10.0, Release Date: 2023-05-20, with similar results.Checklist
- I have searched the existing issues for a bug report that matches the one I want to file, without success.
- I have read the documentation and troubleshoot guide