gap-system / gap / 9864

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Fix QuickUnsolvabilityTestPerm for trivial groups

Normally, we should not even call `QuickUnsolvabilityTestPerm` with trivial
inputs, because `QuickUnsolvabilityTestPerm` is only used in a solvability
check, and `IsTrivial and IsGroup` implies `IsSolvableGroup`. But there are
ways to create trivial permutation groups which do not yet know that they are
trivial, e.g. when dealign with automorphism groups, and that can lead to an
error without this fix.

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