Autocompletion does not work for complex object module outputs

Prerequisites

[x] Ensure you have latest version of plugin installed
[x] Search for possible issue duplicates

Installation details

[x] IDE version (Help->About->Copy to Clipboard)

IntelliJ IDEA 2019.2.3 (Community Edition)
Build #IC-192.6817.14, built on September 24, 2019
Runtime version: 11.0.4+10-b304.69 x86_64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
macOS 10.14.6
GC: ParNew, ConcurrentMarkSweep
Memory: 1981M
Cores: 8
Registry: 
Non-Bundled Plugins: org.intellij.plugins.hcl, org.intellij.scala, org.jetbrains.plugins.hocon

[x] intellij-hcl plugin version (Settings->Plugins)
```
0.7.7
```
[x] Terraform version (terraform -v)
```
Terraform v0.12.6
```

Terraform Configuration Files

./child/main.tf

output "complex" {
  value = {
    top = {
      middle = {
        bottom = "nope"
      }
    }
  }
}

./main.tf

module "child" {
  source = "./child"
}

output "test" {
  value = module.child.complex.top.middle.bottom
}

Exception

Unresolved reference top

Expected Behavior

top, middle, and bottom should all resolve, as this is valid terraform code in version 0.12.*.

Actual Behavior

top (and thus all three) don't resolve note: terraform validate succeeds

Steps to Reproduce

Place cursor after value = module.child.complex
Invoke completion.

VladRassokhin / intellij-hcl

Autocompletion does not work for complex object module outputs #279