SSH command creates empty public key and errors

### Describe the bug

Running `az ssh vm --ip {ip}`

```
az ssh vm --ip 10.196.244.148
fdopen C:\\Users\\bjo.FNC\\AppData\\Local\\Temp\\aadsshcertkveyr768\\id_rsa.pub failed: eother
Could not parse public key. Error: Incorrectly formatted public key. Key must be format ' '
```

Extension version:
```
PS C:\Users\bjo.FNC> az extension list
[
{
"experimental": false,
"extensionType": "whl",
"name": "ssh",
"path": "C:\\CliExtensions\\ssh",
"preview": false,
"version": "1.1.6"
}
]
```

### Related command

az ssh vm --ip {ip}

### Errors

Could not parse public key. Error: Incorrectly formatted public key. Key must be format ' '

### Issue script & Debug output

PS C:\Users\bjo.FNC> az ssh vm --ip $ip --debug
cli.knack.cli: Command arguments: ['ssh', 'vm', '--ip', '10.196.244.148', '--debug']
cli.knack.cli: __init__ debug log:
Enable color in terminal.
Enable VT mode.
cli.knack.cli: Event: Cli.PreExecute []
cli.knack.cli: Event: CommandParser.OnGlobalArgumentsCreate [, , ]
cli.knack.cli: Event: CommandInvoker.OnPreCommandTableCreate []
cli.azure.cli.core: Modules found from index for 'ssh': ['azext_ssh']
cli.azure.cli.core: Loading command modules:
cli.azure.cli.core: Name Load Time Groups Commands
cli.azure.cli.core: Total (0) 0.000 0 0
cli.azure.cli.core: These extensions are not installed and will be skipped: ['azext_ai_examples', 'azext_next']
cli.azure.cli.core: Loading extensions:
cli.azure.cli.core: Name Load Time Groups Commands Directory
cli.azure.cli.core: ssh 0.207 1 4 C:\CliExtensions\ssh
cli.azure.cli.core: Total (1) 0.207 1 4
cli.azure.cli.core: Loaded 1 groups, 4 commands.
cli.azure.cli.core: Found a match in the command table.
cli.azure.cli.core: Raw command : ssh vm
cli.azure.cli.core: Command table: ssh vm
cli.knack.cli: Event: CommandInvoker.OnPreCommandTableTruncate []
cli.azure.cli.core.azlogging: metadata file logging enabled - writing logs to 'C:\Users\bjo.FNC\.azure\commands\2023-07-27.10-34-36.ssh_vm.10476.log'.
az_command_data_logger: command args: ssh vm --ip {} --debug
cli.knack.cli: Event: CommandInvoker.OnPreArgumentLoad [.add_subscription_parameter at 0x03D3F2B0>]
cli.knack.cli: Event: CommandInvoker.OnPostArgumentLoad []
cli.knack.cli: Event: CommandInvoker.OnPostCommandTableCreate [.add_ids_arguments at 0x03D4D1D8>, .add_cache_arguments at 0x03D4D3D0>]
cli.knack.cli: Event: CommandInvoker.OnCommandTableLoaded []
cli.knack.cli: Event: CommandInvoker.OnPreParseArgs []
cli.knack.cli: Event: CommandInvoker.OnPostParseArgs [, , .parse_ids_arguments at 0x03D4D388>]
az_command_data_logger: extension name: ssh
az_command_data_logger: extension version: 1.1.6
cli.azure.cli.core.commands.client_factory: Getting management service client client_type=ComputeManagementClient
cli.azure.cli.core.auth.persistence: build_persistence: location='C:\\Users\\bjo.FNC\\.azure\\msal_token_cache.bin', encrypt=True
cli.azure.cli.core.auth.binary_cache: load: C:\Users\bjo.FNC\.azure\msal_http_cache.bin
urllib3.util.retry: Converted retries value: 1 -> Retry(total=1, connect=None, read=None, redirect=None, status=None)
msal.authority: openid_config = {'token_endpoint': 'https://login.microsoftonline.com/d540db14-ce3e-4d18-adfb-75a65e88f7d7/oauth2/v2.0/token', 'token_endpoint_auth_methods_supported': ['client_secret_post', 'private_key_jwt', 'client_secret_basic'], 'jwks_uri': 'https://login.microsoftonline.com/d540db14-ce3e-4d18-adfb-75a65e88f7d7/discovery/v2.0/keys', 'response_modes_supported': ['query', 'fragment', 'form_post'], 'subject_types_supported': ['pairwise'], 'id_token_signing_alg_values_supported': ['RS256'], 'response_types_supported': ['code', 'id_token', 'code id_token', 'id_token token'], 'scopes_supported': ['openid', 'profile', 'email', 'offline_access'], 'issuer': 'https://login.microsoftonline.com/d540db14-ce3e-4d18-adfb-75a65e88f7d7/v2.0', 'request_uri_parameter_supported': False, 'userinfo_endpoint': 'https://graph.microsoft.com/oidc/userinfo', 'authorization_endpoint': 'https://login.microsoftonline.com/d540db14-ce3e-4d18-adfb-75a65e88f7d7/oauth2/v2.0/authorize', 'device_authorization_endpoint': 'https://login.microsoftonline.com/d540db14-ce3e-4d18-adfb-75a65e88f7d7/oauth2/v2.0/devicecode', 'http_logout_supported': True, 'frontchannel_logout_supported': True, 'end_session_endpoint': 'https://login.microsoftonline.com/d540db14-ce3e-4d18-adfb-75a65e88f7d7/oauth2/v2.0/logout', 'claims_supported': ['sub', 'iss', 'cloud_instance_name', 'cloud_instance_host_name', 'cloud_graph_host_name', 'msgraph_host', 'aud', 'exp', 'iat', 'auth_time', 'acr', 'nonce', 'preferred_username', 'name', 'tid', 'ver', 'at_hash', 'c_hash', 'email'], 'kerberos_endpoint': 'https://login.microsoftonline.com/d540db14-ce3e-4d18-adfb-75a65e88f7d7/kerberos', 'tenant_region_scope': 'EU', 'cloud_instance_name': 'microsoftonline.com', 'cloud_graph_host_name': 'graph.windows.net', 'msgraph_host': 'graph.microsoft.com', 'rbac_url': 'https://pas.windows.net'}
msal.application: Broker enabled? False
cli.azext_ssh.ssh_utils: Platform architecture: 32bit
cli.azext_ssh.ssh_utils: OS architecture: 64bit
cli.azext_ssh.ssh_utils: System Root: C:\Windows
cli.azext_ssh.ssh_utils: Attempting to run ssh-keygen from path C:\Windows\SysNative\openSSH\ssh-keygen.exe
cli.azext_ssh.ssh_utils: Running ssh-keygen command C:\Windows\SysNative\openSSH\ssh-keygen.exe -f C:\Users\bjo.FNC\AppData\Local\Temp\aadsshcertqe35r_03\id_rsa -t rsa -q -N
fdopen C:\\Users\\bjo.FNC\\AppData\\Local\\Temp\\aadsshcertqe35r_03\\id_rsa.pub failed: eother
cli.azure.cli.core.azclierror: Traceback (most recent call last):
File "C:\CliExtensions\ssh\azext_ssh\custom.py", line 359, in _get_modulus_exponent
parser.parse(public_key_text)
File "C:\CliExtensions\ssh\azext_ssh\rsa_parser.py", line 26, in parse
raise ValueError(error_str)
ValueError: Incorrectly formatted public key. Key must be format ' '

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 233, in invoke
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 663, in execute
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 726, in _run_jobs_serially
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 697, in _run_job
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/__init__.py", line 333, in __call__
File "D:\a\_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/command_operation.py", line 121, in handler
File "C:\CliExtensions\ssh\azext_ssh\custom.py", line 66, in ssh_vm
_do_ssh_op(cmd, ssh_session, op_call)
File "C:\CliExtensions\ssh\azext_ssh\custom.py", line 177, in _do_ssh_op
op_info.cert_file, op_info.local_user = _get_and_write_certificate(cmd, op_info.public_key_file,
File "C:\CliExtensions\ssh\azext_ssh\custom.py", line 219, in _get_and_write_certificate
data = _prepare_jwk_data(public_key_file)
File "C:\CliExtensions\ssh\azext_ssh\custom.py", line 248, in _prepare_jwk_data
modulus, exponent = _get_modulus_exponent(public_key_file)
File "C:\CliExtensions\ssh\azext_ssh\custom.py", line 361, in _get_modulus_exponent
raise azclierror.FileOperationError(f"Could not parse public key. Error: {str(e)}")
azure.cli.core.azclierror.FileOperationError: Could not parse public key. Error: Incorrectly formatted public key. Key must be format ' '

cli.azure.cli.core.azclierror: Could not parse public key. Error: Incorrectly formatted public key. Key must be format ' '
az_command_data_logger: Could not parse public key. Error: Incorrectly formatted public key. Key must be format ' '
cli.knack.cli: Event: Cli.PostExecute []
az_command_data_logger: exit code: 1
cli.__main__: Command ran in 2.260 seconds (init: 0.499, invoke: 1.761)
telemetry.main: Begin splitting cli events and extra events, total events: 1
telemetry.client: Accumulated 0 events. Flush the clients.
telemetry.main: Finish splitting cli events and extra events, cli events: 1
telemetry.save: Save telemetry record of length 3531 in cache
telemetry.check: Returns Positive.
telemetry.main: Begin creating telemetry upload process.
telemetry.process: Creating upload process: "C:\Program Files (x86)\Microsoft SDKs\Azure\CLI2\python.exe C:\Program Files (x86)\Microsoft SDKs\Azure\CLI2\Lib\site-packages\azure\cli\telemetry\__init__.pyc C:\Users\bjo.FNC\.azure"
telemetry.process: Return from creating process
telemetry.main: Finish creating telemetry upload process.

### Expected behavior

Shoulssh and connect automatically

### Environment Summary

azure-cli 2.47.0 *

core 2.47.0 *
telemetry 1.0.8

Extensions:
ssh 1.1.6

Dependencies:
msal 1.20.0
azure-mgmt-resource 22.0.0

Python location 'C:\Program Files (x86)\Microsoft SDKs\Azure\CLI2\python.exe'
Extensions directory 'C:\CliExtensions'

Python (Windows) 3.10.10 (tags/v3.10.10:aad5f6a, Feb 7 2023, 17:05:00) [MSC v.1929 32 bit (Intel)]

Legal docs and information: aka.ms/AzureCliLegal

You have 2 update(s) available. Consider updating your CLI installation with 'az upgrade'

### Additional context

Public key file referenced is an empty file