op cli crash on account get

Hi,

This looks like new. op crash on account get call.

```
op --version
2.6.0

op account get --account="MYACCOUNTUUID"
panic: value method go.1password.io/op/core/b5/api/credentials.SigninSRPComputedXCredentials.GetUserUUID called using nil *SigninSRPComputedXCredentials pointer

goroutine 1 [running]:
go.1password.io/op/core/b5/api/credentials.(*SigninSRPComputedXCredentials).GetUserUUID(0x0, 0x14000ac8000, 0x1400025f3e8)
:1 +0x64
go.1password.io/op/core/b5/api.SigninWithCredentialsAndHeaders(0x1036f4b98, 0x0, 0x14000124a20, 0x1a, 0x103492cc8, 0xd, 0x103487a7a, 0x7, 0x1400011ef30, 0x22, ...)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/core/b5/api/signin.go:38 +0x78
go.1password.io/op/core/b5/api.SigninWithCredentials(...)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/core/b5/api/signin.go:33
go.1password.io/op/core/b5/api.(*baseAuthController).Authenticate(0x14000156240, 0x0, 0x0)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/core/b5/api/authcontroller.go:112 +0x100
go.1password.io/op/core/b5/api.(*baseAuthController).Session(0x14000156240, 0x0)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/core/b5/api/authcontroller.go:90 +0x30
go.1password.io/op/core/b5/api/request/endpoint.Endpoint.Request(0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1034995b7, 0x17, ...)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/core/b5/api/request/endpoint/endpoint.go:23 +0x38
go.1password.io/op/core/b5/api.(*KeysetsAPI).GetAllEncrypted(0x14000ac4020, 0x1032cf89c, 0x103b1c120, 0x14000ac4040)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/core/b5/api/keysets.go:32 +0xf0
go.1password.io/op/core/b5/api.(*KeysetsAPI).getAll(0x14000ac4020, 0x140008f8070, 0x1400025f958, 0x1032e231c, 0x10)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/core/b5/api/keysets.go:51 +0x28
go.1password.io/op/core/b5/api.NewKeysetController(0x1036ed7f8, 0x14000156240, 0x0, 0x0, 0x10364a360, 0x1400011de80, 0x0)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/core/b5/api/keysetcontroller.go:47 +0xd4
go.1password.io/op/core/b5.NewAPIWithAuthControllerAndCache(0x1036ed7f8, 0x14000156240, 0x140001135a0, 0x0, 0x0, 0x140001135a0)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/core/b5/api.go:75 +0x80
go.1password.io/op/core/b5.NewAPIWithSessionAndCache(0x14000126700, 0x140001135a0, 0x1036e1488, 0x140001930d0, 0x14000126700)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/core/b5/api.go:62 +0xa4
go.1password.io/op/op-cli/command.initSessionFunc.func1(0x1400025fcd8, 0x1030d15ac, 0x1400030ca00)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/op-cli/command/root.go:503 +0xc50
go.1password.io/op/op-cli/command.(*accountGetCommand).Run(0x14000112690, 0x0, 0x1400025fcc0)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/op-cli/command/account_get.go:40 +0x2c
go.1password.io/op/op-cli/command.Bind.func3(0x14000177340, 0x14000113190, 0x0, 0x1, 0x0, 0x0)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/op-cli/command/command.go:71 +0x70
github.com/spf13/cobra.(*Command).execute(0x14000177340, 0x14000113180, 0x1, 0x1, 0x14000177340, 0x14000113180)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/vendor/github.com/spf13/cobra/command.go:844 +0x320
github.com/spf13/cobra.(*Command).ExecuteC(0x103ae3100, 0x10347be28, 0x103491078, 0xa)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/vendor/github.com/spf13/cobra/command.go:952 +0x258
go.1password.io/op/op-cli/command.Execute(0x0)
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/op-cli/command/root.go:314 +0x50
main.main()
/Users/iosdev/GitLab_CI_Builds/QNhFsVqy/0/dev/b5/op/op-cli/main.go:15 +0x44
```

---

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OS Version: 12.5
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