New-AzureRmAutomationCredential odd error message

[microsmith]

New-AzureRmAutomationCredential displays "Input string was not in a correct format" when the credential name already exists. Would be better if it displayed something like "Name myPsCredential already exists".

New-AzurermAutomationCredential : Input string was not in a correct format.
At line:1 char:1

• New-AzurermAutomationCredential -AutomationAccountName "PStest" -Name "myPsCrede ...

• - CategoryInfo          : CloseError: (:) [New-AzureRmAutomationCredential], FormatException
  - FullyQualifiedErrorId : Microsoft.Azure.Commands.Automation.Cmdlet.NewAzureAutomationCredential
    <!---@tfsbridge:{"tfsId":5730364}-->
  

[markcowl]

@microsmith Thanks for the report, we'll take a look.

[maddieclayton]

Closing in favor of: #2265