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fix: prevent NullReferenceException in CommandLog.AppendLine after completion #4699

Job	Run time
Prepare version string	6s
Build / Build Windows ARM64	4m 7s
Build / Build Linux	2m 59s
Build / Build Windows x64	3m 51s
Build / Build macOS (Apple Silicon)	3m 28s
Build / Build Linux (arm64)	3m 19s
Build / Build macOS (Intel)	4m 55s
Package / Package Windows (win-arm64)	29s
Package / Package macOS (osx-x64)	18s
Package / Package macOS (osx-arm64)	17s
Package / Package Linux (linux-x64)	58s
Package / Package Windows (win-x64)	23s
Package / Package Linux (linux-arm64)	58s
	26m 8s