Handle nil lastJoinedAt in controller #4630

Job	Run time
Fablab HA Smoketest	0s
Fablab HA Smoketest	0s
Fablab Smoketest	23s
Fablab Smoketest	21m 59s
Build Linux binaries	18s
Build Linux binaries	7m 18s
Build Mac OS binaries	13s
Build Mac OS binaries	4m 59s
Run Unit and Integration Tests	10s
Run Unit and Integration Tests	9m 41s
Build Windows binaries	22s
Build Windows binaries	4m 4s
Teardown HA SmokeTest	2s
Teardown HA SmokeTest	3s
Teardown SmokeTest	11s
Teardown SmokeTest	2m 13s
Publish Binaries	0s
Publish Binaries	36s
Publish Release Candidate Docker Images	0s
Publish Release Candidate Docker Images	0s
Publish Release Candidate Linux Packages	0s
Publish Release Candidate Linux Packages	0s
	52m 32s

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