fix #508 by checking for `.Values.nextcloud.existingSecret.tokenKey` #1083

Job	Run time
changes	8s
lint	55s
test (Default - no custom values)	1m 47s
test (PostgreSQL Enabled, --helm-extra-set-args "--set=postgresql.enabled=true --set=postgresql.g...	2m 12s
test (Nginx Enabled, --helm-extra-set-args "--set=image.flavor=fpm --set=nginx.enabled=true")	1m 42s
test (Horizontal Pod Autoscaling Enabled, --helm-extra-set-args "--set=hpa.enabled=true --set=hpa...	1m 58s
test (S3 Enabled as Primary Storage, --namespace nextcloud --skip-clean-up --helm-extra-set-args ...	1m 56s
summary	6s
	10m 44s

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