runtime error detecting format from filename ending with .

[Zash]

Describe the bug
Crash when given a filename that ends with a period ..

Version of yq: v4.43.1
Operating system: Debian 12
Installed via: Download from Github releases

~$ yq . some-file.
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x84fee0]

goroutine 1 [running]:
github.com/mikefarah/yq/v4/cmd.configureDecoder(0x0)
	/home/runner/work/yq/yq/cmd/utils.go:118 +0x40
github.com/mikefarah/yq/v4/cmd.evaluateSequence(0xc000200308, {0xc00003caa0, 0x2, 0x2})
	/home/runner/work/yq/yq/cmd/evaluate_sequence_command.go:112 +0x35d
github.com/spf13/cobra.(*Command).execute(0xc000200308, {0xc00003ca40, 0x2, 0x2})
	/home/runner/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:983 +0xaca
github.com/spf13/cobra.(*Command).ExecuteC(0xc000200008)
	/home/runner/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:1115 +0x3ff
github.com/spf13/cobra.(*Command).Execute(0xc000032720?)
	/home/runner/go/pkg/mod/github.com/spf13/cobra@v1.8.0/command.go:1039 +0x13
main.main()
	/home/runner/work/yq/yq/yq.go:22 +0x1a8

Discovered because I had two files with similar names, differing only in file extension and autocomplete stopped at the ..

[mikefarah]

Thanks for raising, will fix in next release

[mikefarah]

Fixed in 4.44.1