section panic

[weidongbcn]

Describe the bug
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x1 pc=0x4c3bcf]

goroutine 1 [running]:
github.com/go-ini/ini.(*File).SectionsByName(0x0, 0x4f10d6, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0)
/home/debian/go/pkg/mod/github.com/go-ini/[email protected]/file.go:147 +0x6f
github.com/go-ini/ini.(*File).GetSection(...)
/home/debian/go/pkg/mod/github.com/go-ini/[email protected]/file.go:134
github.com/go-ini/ini.(*File).Section(0x0, 0x4f10d6, 0x8, 0x406185)
/home/debian/go/pkg/mod/github.com/go-ini/[email protected]/file.go:166 +0x45

To Reproduce
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Expected behavior
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