Powershell: Get-Date -UFormat '' 为空字符串参数抛出一个无用的异常

Get-Date -UFormat ''中的空字符串参数会抛出IndexOutOfRangeException ，如果错误说明出了什么问题并将注意力转移到 UFormat 参数上会更有帮助。 “缺少或无效的 UFormat 字符串”或类似的词。

重现步骤

PS /test> get-date -uformat "$accidentallyEmptyFormatStringVariable"
get-date : Index was outside the bounds of the array.
At line:1 char:1
+ get-date -uformat ''
+ ~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Get-Date], IndexOutOfRangeException
    + FullyQualifiedErrorId : System.IndexOutOfRangeException,Microsoft.PowerShell.Commands.GetDateCommand

预期行为

A message directing attention to the -UFormat string parameter being empty.

实际行为

A message about some internal problem.

环境数据

> $PSVersionTable
Name                           Value
----                           -----
PSVersion                      6.0.0-beta.8
PSEdition                      Core
GitCommitId                    v6.0.0-beta.8
OS                             Linux 2.6.32-042stab120.6 #1 SMP Thu Oct 27 16:59:03 MSK 2016
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0