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NuGet task 2.167.4 breaks with `##[error]Invalid Version: null`

See original GitHub issue

Required Information

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Question, Bug, or Feature? Bug Enter Task Name: NuGet 2.167.4

Environment

Azure Pipelines, Windows Hosted Agents: https://dev.azure.com/monacotools/Monaco/_build/results?buildId=71481&view=logs&j=ef19874c-dd89-559a-7822-f5a414b01ba4&t=4896892c-c3d0-5a70-c160-70c47766e990&l=5

Issue Description

NuGet v2.167.4 breaks our build when restoring NuGet packages from a private source:

It worked yesterday when it was on v2.167.2:

Here’s the task usage: https://github.com/microsoft/vscode/blob/master/build/azure-pipelines/win32/product-build-win32.yml#L224:L231

Task logs

2020-04-08T09:20:38.6561215Z ##[section]Starting: Install ESRPClient.exe
2020-04-08T09:20:38.6694108Z ==============================================================================
2020-04-08T09:20:38.6694896Z Task         : NuGet
2020-04-08T09:20:38.6695872Z Description  : Restore, pack, or push NuGet packages, or run a NuGet command. Supports NuGet.org and authenticated feeds like Azure Artifacts and MyGet. Uses NuGet.exe and works with .NET Framework apps. For .NET Core and .NET Standard apps, use the .NET Core task.
2020-04-08T09:20:38.6696854Z Version      : 2.167.4
2020-04-08T09:20:38.6697358Z Author       : Microsoft Corporation
2020-04-08T09:20:38.6697991Z Help         : https://docs.microsoft.com/azure/devops/pipelines/tasks/package/nuget
2020-04-08T09:20:38.6698682Z ==============================================================================
2020-04-08T09:20:39.4512022Z Caching tool: NuGet 4.1.0 x64
2020-04-08T09:20:39.4962154Z Found tool in cache: NuGet 4.1.0 x64
2020-04-08T09:20:39.5017267Z Resolved from tool cache: 4.1.0
2020-04-08T09:20:39.5018685Z Using version: 4.1.0
2020-04-08T09:20:39.5464301Z ##[error]Invalid Version: null
2020-04-08T09:20:39.6523428Z ##[section]Finishing: Install ESRPClient.exe