[MKP] Deployment should not use CloudSQL if the DB connection fields are empty

[Ark-kun]

Currently if you mark the "managed storage" checkbox and click Deploy without filling the CloudSQL fields you get a broken deployment:

2020-05-20T07:39:51.406651156Z 2020/05/20 07:39:51 New connection for ""
2020-05-20T07:39:51.406679592Z 2020/05/20 07:39:51 Throttling refreshCfg(): it was only called 3.51263ms ago
2020-05-20T07:39:51.406686650Z 2020/05/20 07:39:51 couldn't connect to "": ensure that the account has access to "" (and make sure there's no typo in that name). Error during createEphemeral for : googleapi: Error 403: Cloud SQL Admin API has not been used in project 640001104961 before or it is disabled. Enable it by visiting https://console.developers.google.com/apis/api/sqladmin.googleapis.com/overview?project=640001104961 then retry. If you enabled this API recently, wait a few minutes for the action to propagate to our systems and retry., accessNotConfigured

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been automatically closed because it has not had recent activity. Please comment "/reopen" to reopen it.

[Ark-kun]

/rozen

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This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[github-actions[bot]]

This issue has been automatically closed because it has not had recent activity. Please comment "/reopen" to reopen it.