Fix TypeError: 'NoneType' object is not subscriptable #956

Job	Run time
Build Docker Image (linux/amd64, amd64)	1m 2s
Build Docker Image (linux/arm/v7, armv7)	4m 51s
Build Docker Image (linux/arm64, arm64)	4m 6s
Build Docker Image (linux/arm/v6, armv6)	5m 29s
Test Image (amd64)	30s
Test Image (armv7)	30s
Test Image (arm64)	31s
Test Image (armv6)	33s
Publish Image (amd64, registry.hub.docker.com)	24s
Publish Image (amd64, ghcr.io/diyhue)	28s
Publish Image (armv7, registry.hub.docker.com)	23s
Publish Image (armv7, ghcr.io/diyhue)	27s
Delete failed artifacts	0s
Publish Image (arm64, registry.hub.docker.com)	33s
Publish Image (arm64, ghcr.io/diyhue)	22s
Publish Image (armv6, registry.hub.docker.com)	26s
Publish Image (armv6, ghcr.io/diyhue)	20s
Tag Images (Manifest) (registry.hub.docker.com)	22s
Tag Images (Manifest) (ghcr.io/diyhue)	6s
Tag Images (amd64, registry.hub.docker.com)	24s
Tag Images (amd64, ghcr.io/diyhue)	23s
Tag Images (armv7, registry.hub.docker.com)	22s
Tag Images (armv7, ghcr.io/diyhue)	23s
Tag Images (arm64, registry.hub.docker.com)	24s
Tag Images (arm64, ghcr.io/diyhue)	24s
Tag Images (armv6, registry.hub.docker.com)	26s
Tag Images (armv6, ghcr.io/diyhue)	22s
Tag images to correct architecture (registry.hub.docker.com)	5s
Tag images to correct architecture (ghcr.io/diyhue)	4s
	24m 40s

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