fix: postgresql model validation errors

[nschonni]

Remove empty body to fix RESPONSE_SCHEMA_NOT_IN_SPEC errors

[openapi-sdkautomation]

SDK Automation [Logs] (Generated from 26b48f2, Iteration 1)

Python: Azure/azure-sdk-for-python [Logs] [Diff]

• azure-mgmt-rdbms [Logs] [Instructions] [Generation PR] [Integration PR]
  • azure-mgmt-rdbms-1.9.0.zip
  • azure_mgmt_rdbms-1.9.0-py2.py3-none-any.whl

Java: Azure/azure-sdk-for-java [Logs] [Diff]

• postgresql/resource-manager/v2017_12_01 [Logs] [Generation PR] [Integration PR]
• postgresql/resource-manager/v2017_12_01_preview [Logs] [Generation PR] [Integration PR]

Go: test-repo-billy/azure-sdk-for-go [Logs] [Diff]

• postgresql/mgmt/2017-12-01 [Logs]
• preview/postgresql/mgmt/2017-12-01-preview [Logs]

JavaScript: Azure/azure-sdk-for-js [Logs] [Diff]

• @azure/arm-postgresql [Logs] [Instructions] [Generation PR] [Integration PR]
  • azure-arm-postgresql-4.4.0.tgz

[AutorestCI]

Automation for azure-sdk-for-go

Unable to detect any generation context from this PR.

[AutorestCI]

Automation for azure-sdk-for-python

Unable to detect any generation context from this PR.

[azuresdkci]

Can one of the admins verify this patch?