Creating a private endpoint approval on a postgresdb - endpoint created but this error was received.

### **This is autogenerated. Please review and update as needed.**

## Describe the bug

**Command Name**
`az network private-endpoint-connection approve`

**Errors:**
```
The command failed with an unexpected error. Here is the traceback:
Expecting value: line 1 column 1 (char 0)
Traceback (most recent call last):
File "/usr/lib64/az/lib/python3.6/site-packages/knack/cli.py", line 231, in invoke
cmd_result = self.invocation.execute(args)
File "/usr/lib64/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 657, in execute
raise ex
File "/usr/lib64/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 720, in _run_jobs_serially
results.append(self._run_job(expanded_arg, cmd_copy))
File "/usr/lib64/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 691, in _run_job
result = cmd_copy(params)
File "/usr/lib64/az/lib/python3.6/site-packages/azure/cli/core/commands/__init__.py", line 328, in __call__
return self.handler(*args, **kwargs)
File "/usr/lib64/az/lib/python3.6/site-packages/azure/cli/core/commands/command_operation.py", line 121, in handler
return op(**command_args)
File "/usr/lib64/az/lib/python3.6/site-packages/azure/cli/command_modules/network/private_link_resource_and_endpoint_connections/custom.py", line 103, in approve_private_endpoint_connection
approval_description)
File "/usr/lib64/az/lib/python3.6/site-packages/azure/cli/command_modules/network/private_link_resource_and_endpoint_connections/resource_providers/__init__.py", line 102, in approve_private_endpoint_connection
description=approval_description)
File "/usr/lib64/az/lib/python3.6/site-packages/azure/cli/command_modules/network/private_link_resource_and_endpoint_connections/resource_providers/__init__.py", line 58, in _update_private_endpoint_connection_status
private_endpoint_connection_name)
File "/usr/lib64/az/lib/python3.6/site-packages/azure/cli/command_modules/network/private_link_resource_and_endpoint_connections/resource_providers/__init__.py", line 123, in show_private_endpoint_connection
return r.json()
File "/usr/lib64/az/lib/python3.6/site-packages/requests/models.py", line 900, in json
return complexjson.loads(self.text, **kwargs)
File "/usr/lib64/python3.6/json/__init__.py", line 354, in loads
return _default_decoder.decode(s)
File "/usr/lib64/python3.6/json/decoder.py", line 339, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/usr/lib64/python3.6/json/decoder.py", line 357, in raw_decode
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

```

## To Reproduce:
Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

- _Put any pre-requisite steps here..._
- `az network private-endpoint-connection approve -g {} -n {} --resource-name {} --type {} --description {}`

## Expected Behavior

## Environment Summary
```
Linux-4.18.0-193.47.1.el8_2.x86_64-x86_64-with-redhat-8.2-Ootpa
Python 3.6.8
Installer: RPM

azure-cli 2.26.1

```
## Additional Context