invalid memory address or nil pointer dereference

[roadlit]

Hi there,

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OS Version:

Windows

Commit hash : (if develop)

Expected behavior

panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x0 pc=0x997ad0]

goroutine 240 [running]:
github.com/vechain/thor/cmd/thor/node.(*Node).txStashLoop(0xc042e2e720, 0xbd7ec0, 0xc0422e6b40)
D:/Code/GoCode/src/github.com/vechain/thor/cmd/thor/node/node.go:223 +0x580
github.com/vechain/thor/cmd/thor/node.(*Node).Run.func2()
D:/Code/GoCode/src/github.com/vechain/thor/cmd/thor/node/node.go:77 +0x43
github.com/vechain/thor/co.(*Goes).Go.func1(0xc042e2e720, 0xc042e24740)
D:/Code/GoCode/src/github.com/vechain/thor/co/goes.go:22 +0x56
created by github.com/vechain/thor/co.(*Goes).Go
D:/Code/GoCode/src/github.com/vechain/thor/co/goes.go:20 +0x69

Steps to reproduce the behavior

just run the thor client

[qianbin]

Fixed by #75