[dev.typeparams] go/types: fix panic with nil package name
This is a straightforward port of CL 320490 to go/types. Change-Id: I763c806c777f926a563d8f9384764e5b3f7f083c Reviewed-on: https://go-review.googlesource.com/c/go/+/324732 Trust: Robert Findley <rfindley@google.com> Run-TryBot: Robert Findley <rfindley@google.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by:Robert Griesemer <gri@golang.org>
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