Fixed error of inconsistent conditional result types when evaluating …

[apichick]

…local peer_gateway variable

I was getting the following error:

│ Error: Inconsistent conditional result types
│
│   on .terraform/modules/nonprod_hub.ipsec_over_interconnect/modules/net-ipsec-over-interconnect/main.tf line 20, in locals:
│   19:     var.peer_gateway_config.create
│   20:     ? try(google_compute_external_vpn_gateway.default[0], null)
│   21:     : var.peer_gateway_config
│     ├────────────────
│     │ google_compute_external_vpn_gateway.default[0] is object with 9 attributes
│     │ var.peer_gateway_config is object with 5 attributes
│     │ var.peer_gateway_config.create is true
│
│ The true and false result expressions must have consistent types. The 'true' value includes object attribute "interface", which is
│ absent in the 'false' value.

[wiktorn]

Usual approach that we have in such cases would be to have data resource, that would return the whole structure of google_compute_external_vpn_gateway instead of using config. But such data resource does not exists 😱

The other approach to fix this is to add to output description, that it returns gateway resource only if autocreated.