text/template: fix nil crash on Templates
Fixes #3872.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/6612060
diff --git a/src/pkg/text/template/exec_test.go b/src/pkg/text/template/exec_test.go
index d793651..683e9ac 100644
--- a/src/pkg/text/template/exec_test.go
+++ b/src/pkg/text/template/exec_test.go
@@ -811,3 +811,8 @@
 		t.Errorf("expected %q got %q", expect, result)
 	}
 }
+
+func TestExecuteOnNewTemplate(t *testing.T) {
+	// This is issue 3872.
+	_ = New("Name").Templates()
+}