dotnet pack stops working with empty paket.references

Description

dotnet pack crashes if paket.references is empty. It's a template project so I'd like to have paket.references even if the file itself is empty.

Repro steps

mkdir xxx && cd xxx && dotnet new console && dotnet restore
dotnet pack

NOTE: so far dotnet pack works. Now we need paket available (I have a batch file for that curl -L -o paket.cmd http://bit.ly/2ooaInt)

Now, let's create empty paket.depenencies and paket.references:

paket init && touch paket.references && paket install && dotnet restore
dotnet pack

dotnet pack just stopped working.

Expected behavior

It creates nuget package.

Actual behavior

C:\dev\xxx\.paket\Paket.Restore.targets(59,5): error MSB3073: The command ""C:\dev\xxx\.paket\paket.exe" fix-nuspec file "obj\xxx.1.0.0.nuspec" references-file "C:\dev\xxx/obj/xxx.csproj.references" " exited with code 1. [C:\dev\xxx\xxx.csproj]

Known workarounds

Do not use empty paket.references

Start by reproducing the failure with the listed dotnet and paket commands, then inspect .paket/Paket.Restore.targets around line 59 and the generated obj/xxx.csproj.references file. Done means dotnet pack succeeds and creates the NuGet package when paket.references is empty.