Add a fallback for when project version is `unspecified` #385

Job	Run time
Test Processing	3m 29s
(windows/x64) Create Processing Build	6m 1s
(linux/aarch64) Create Processing Build	3m 21s
(linux/x64) Create Processing Build	3m 49s
(macos/x64) Create Processing Build	4m 31s
(macos/aarch64) Create Processing Build	4m 13s
	25m 24s

Provide feedback