Fixed a crash when scrolling through an empty list, which occurred wh…

[pjaudiomv]

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panic: runtime error: index out of range [0] with length 0

goroutine 9 [running]:
github.com/radiusmethod/promptui/list.(*List).Index(...)
	/Users/pjoyce/Library/Caches/Homebrew/go_mod_cache/pkg/mod/github.com/radiusmethod/promptui@v0.10.0/list/list.go:204
github.com/radiusmethod/promptui.(*Select).innerRun.func1({0x81ced40, 0x0, 0x0}, 0xc0001a6d10?, 0x10)
	/Users/pjoyce/Library/Caches/Homebrew/go_mod_cache/pkg/mod/github.com/radiusmethod/promptui@v0.10.0/select.go:294 +0x132d
github.com/chzyer/readline.(*DumpListener).OnChange(0xc0001a6c80?, {0x81ced40?, 0x70e3cb7?, 0x2?}, 0xc000205f70?, 0x1?)
	/Users/pjoyce/Library/Caches/Homebrew/go_mod_cache/pkg/mod/github.com/chzyer/readline@v1.5.0/operation.go:516 +0x2b
github.com/chzyer/readline.(*Operation).ioloop(0xc0001e8070)
	/Users/pjoyce/Library/Caches/Homebrew/go_mod_cache/pkg/mod/github.com/chzyer/readline@v1.5.0/operation.go:339 +0x1ae5
created by github.com/chzyer/readline.NewOperation in goroutine 1
	/Users/pjoyce/Library/Caches/Homebrew/go_mod_cache/pkg/mod/github.com/chzyer/readline@v1.5.0/operation.go:88 +0x2c6