Server: Fix crash when receiving a mine block request on a just destr… #323

Job	Run time
build (windows-latest, windows, x64, .zip, debug)	4m 14s
build (windows-latest, windows, x64, .zip, releasedbg)	4m 37s
build (ubuntu-latest, linux, x86_64, .tar.gz, debug)	3m 58s
build (ubuntu-latest, linux, x86_64, .tar.gz, releasedbg)	4m 10s
build (macos-12, macos, x86_64, .tar.gz, debug)	3m 56s
build (macos-12, macos, x86_64, .tar.gz, releasedbg)	4m 51s
build (macos-14, macos, arm64, .tar.gz, debug)	2m 10s
build (macos-14, macos, arm64, .tar.gz, releasedbg)	2m 16s
	30m 12s

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