interface conversion: interface {} is nil, not string

[filiplindqvist-tv4]

Try to convert-go a JSON I get this error.

➜  grabana_0.22.1_darwin_arm64 ./grabana convert-go -i Profile.json        
2024-03-18T10:49:31+01:00	WARN	golang/variable.go:39	unhandled variable type found: skipped	{"type": "custom", "name": "env"}
2024-03-18T10:49:31+01:00	WARN	golang/variable.go:39	unhandled variable type found: skipped	{"type": "custom", "name": "platform"}
panic: interface conversion: interface {} is nil, not string

goroutine 1 [running]:
github.com/K-Phoen/grabana/encoder/golang.(*Encoder).encodeQueryVar(_, {{0x1400021b1b0, 0xd}, {0x1400021b268, 0x5}, 0x0, 0x0, 0x1400021e7e0, {0x0, 0x1400021b260}, ...})
	/home/runner/work/grabana/grabana/encoder/golang/variable.go:115 +0x50c8
github.com/K-Phoen/grabana/encoder/golang.(*Encoder).encodeVariable(_, {{0x1400021b1b0, 0xd}, {0x1400021b268, 0x5}, 0x0, 0x0, 0x1400021e7e0, {0x0, 0x1400021b260}, ...})
	/home/runner/work/grabana/grabana/encoder/golang/variable.go:31 +0x74
github.com/K-Phoen/grabana/encoder/golang.(*Encoder).encodeVariables(...)
	/home/runner/work/grabana/grabana/encoder/golang/variable.go:13
github.com/K-Phoen/grabana/encoder/golang.(*Encoder).EncodeDashboard(_, {0x59, {0x140000b84e0, 0x24}, {0x0, 0x0}, {0x1400021b380, 0xb}, {0x0, 0x0}, ...})
	/home/runner/work/grabana/grabana/encoder/golang/encoder.go:31 +0x310
github.com/K-Phoen/grabana/encoder.ToGolang(_, {0x59, {0x140000b84e0, 0x24}, {0x0, 0x0}, {0x1400021b380, 0xb}, {0x0, 0x0}, ...})
	/home/runner/work/grabana/grabana/encoder/golang.go:12 +0x58
github.com/K-Phoen/grabana/cmd/cli/cmd.convertGo(0x0?, {{0x16bae3438?, 0x0?}})
	/home/runner/work/grabana/grabana/cmd/cli/cmd/convertGo.go:54 +0x26c
github.com/K-Phoen/grabana/cmd/cli/cmd.ConvertGo.func1(0x14000126400?, {0x1047ac436?, 0x4?, 0x1047ac43a?})
	/home/runner/work/grabana/grabana/cmd/cli/cmd/convertGo.go:26 +0x2c
github.com/spf13/cobra.(*Command).execute(0x140000a5200, {0x140000e0460, 0x2, 0x2})
	/home/runner/work/grabana/grabana/vendor/github.com/spf13/cobra/command.go:983 +0x840
github.com/spf13/cobra.(*Command).ExecuteC(0x140000a4300)
	/home/runner/work/grabana/grabana/vendor/github.com/spf13/cobra/command.go:1115 +0x344
github.com/spf13/cobra.(*Command).Execute(...)
	/home/runner/work/grabana/grabana/vendor/github.com/spf13/cobra/command.go:1039
main.main()
	/home/runner/work/grabana/grabana/cmd/cli/main.go:32 +0x218

Would it be possible to add more diagnostic info to find the error?

Grafana v10.3.3 (252761264e)

Using export JSON and the grabana convert-go command.

Gist: https://gist.github.com/filiplindqvist-tv4/b18c7fa13c8c8c7a18ca24bf191587f0