text/template: Make function call builtin handle nil errors correctly

The call builtin unconditionally tries to convert a second return value from a function to the error type. This fails in case nil is returned, effectively making call useless for functions returning two values.

This CL adds a nil check for the second return value, and adds a test.

Note that for regular function and method calls the nil error case is handled correctly and is verified by a test.

R=r
CC=golang-dev
https://codereview.appspot.com/12804043

Committer: Rob Pike <r@golang.org>