fix(ui): guard against empty plugin prop on connection creation page … #2156

Job	Run time
Get build timestamp	3s
Build and Push devlake base	13m 37s
Build and Push devlake builder	5m 12s
Build and Push grafana image	5m 2s
Build and Push config-ui image	2m 21s
Build and cache devlake (amd64)	10m 12s
Build and cache devlake (arm64)	9m 40s
Build and Push devlake image	19m 31s
	1h 5m 38s

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