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GCP_DNS.ts

Running into this error
```
 gcp:dns:RecordSet (frontend):
    error: unexpected null property rrdatas[0]
```

This is unexpected - I've opened <https://github.com/pulumi/pulumi/issues/2433>.

You should be able to work around this by running `pulumi up --skip-preview` the first time to skip the initial preview - I believe things will work fine after that.  But we need to look into why this is causing the failure.

Alternatively, if your `apply` callback ensured that it always returned a valid string - that would avoid this problem - such as replacing this:

```
return t[0].accessConfigs[0].assignedNatIp;
```

With this:

```
return t[0].accessConfigs[0].assignedNatIp || "";
```

(The ultimate problem is that `.assignedNatIp` is undefined becuase that field does not exist on the `accessConfigs[0]` you provided as input - but that input should never be observable in that form because it will get filled in when the resource is created)