Can't dotnet run in default-directory

[sebasmonia]

When testing #19, I found out that dotnet run doesn't work without a TARGET.
I'm 99% sure this is an existing bug and not introduced in 8d07ccc.

[sebasmonia]

Corrected the error, however there is a challenge now to properly support dotnet run in the current directory without project, I need to add a template without the --project parameter, or add the parameter name with the value only if a project was selected.

On the other hand if I did #11, honestly I would make all the TARGET required. Running things in default-directory works, but it is bound to lead to surprises.