Fix nil dereference in nodes list command. #40
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Fixes a nil pointer dereference observed when listing nodes that have not yet connected. ``` panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xb931a4] goroutine 1 [running]: github.com/juanfont/headscale/cmd/headscale/cli.glob..func8(0x13c93e0, 0xc0004c4220, 0x0, 0x2) /go/src/headscale/cmd/headscale/cli/nodes.go:74 +0x364 github.com/spf13/cobra.(*Command).execute(0x13c93e0, 0xc0004c41e0, 0x2, 0x2, 0x13c93e0, 0xc0004c41e0) /go/pkg/mod/github.com/spf13/[email protected]/command.go:856 +0x2c2 github.com/spf13/cobra.(*Command).ExecuteC(0x13ca2e0, 0xc000497110, 0xe76416, 0x6) /go/pkg/mod/github.com/spf13/[email protected]/command.go:960 +0x375 github.com/spf13/cobra.(*Command).Execute(...) /go/pkg/mod/github.com/spf13/[email protected]/command.go:897 main.main() /go/src/headscale/cmd/headscale/headscale.go:89 +0x805 command terminated with exit code 2 ```
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Fixes a nil pointer dereference observed when listing nodes that have
not yet connected.