GetTokenFromCLIWithParams fixed empty error message if command invoke failed. (#653)
GetTokenFromCLIWithParams fixed empty error message if command invoke failed. (#653)

* Fixed empty error message if cli invoke failed

* Addendum to last commit

* Check stderr for empty string

Co-authored-by: Joel Hendrix <19bc1d1cf4dad233d26a019619bbdb8222a33017@microsoft.com>
Azure/go-autorest