Merge pull request #272 from spacemeshos/fix-nil-exception #1047

Job	Run time
lint	17s
quicktests	25s
unittests (ubuntu-latest)	1m 16s
unittests (self-hosted, linux, arm64)	50s
coverage	1m 2s
unittests (macos-latest)	1m 21s
unittests (self-hosted, macos, arm64)	48s
unittests (windows-latest)	3m 33s
Build postcli (ubuntu-latest)	23s
Build postcli (self-hosted, linux, arm64)	17s
Build postcli (macos-latest)	46s
Build postcli (self-hosted, macos, arm64)	26s
Build postcli (windows-latest)	2m 17s
Publish release	0s
	13m 41s

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