Fix a panic during completion on variables of type *error. As a
predeclared type, the error type has nil package. Fix the crash
resulting from this oversight, as well as a related crash in the tests
analyzer, from which the new completion code was adapted.
Fixesgolang/go#56505
Change-Id: I0707924d0666b238821fd14b6fc34639cc7a9c53
Reviewed-on: https://go-review.googlesource.com/c/tools/+/446815
Auto-Submit: Robert Findley <rfindley@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Robert Findley <rfindley@google.com>
Robert Findley