text/template: don't crash piping to call with no arguments
Fixes #70341
Change-Id: I792b15d5e8d08c3762659fbcdfb3d620b59071ca
Reviewed-on: https://go-review.googlesource.com/c/go/+/628096
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Rob Pike <r@golang.org>
Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Zxilly Chou <zhouxinyu1001@gmail.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>