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Daniel Martí 23e9dc7994 html/template: always write untyped nil as JS null
text/template recently added support for passing untyped nil as function
call arguments, as those would be mixed up with "missing argument"
values before. See CL 95215.

html/template now needs a small change to adapt to that new possibility.
In particular, when printing values as JS bytes, its code was written
under the assumption that the values would never be untyped nil - that
is, the reflect.Value would always be valid.

Short-circuit indirectToJSONMarshaler on an untyped nil, to avoid the
panic and fall back to the existing " null " output. Before this change
and on 1.10, printing a typed nil and an untyped nil resulted in:

	null ""

After this change, one will get:

	null null

Fixes #24717.

Change-Id: I03cd10ef64b96e837bacc9ccf4cf25624d80de1c
Reviewed-on: https://go-review.googlesource.com/109215
Run-TryBot: Daniel Martí <mvdan@mvdan.cc>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rhys Hiltner <rhys@justin.tv>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-05-09 04:09:29 +00:00
.github github: update Pull Request template 2018-02-21 02:07:46 +00:00
api syscall: introduce Pointer type and use it instead of uintptr 2018-04-18 08:50:42 +00:00
doc doc/faq: tidy up a couple of nits 2018-05-08 19:57:49 +00:00
lib/time all: use HTTPS for iana.org links 2018-02-13 18:36:48 +00:00
misc misc/ios: retry iOS launch even if no device app path was found 2018-05-08 15:00:57 +00:00
src html/template: always write untyped nil as JS null 2018-05-09 04:09:29 +00:00
test test: fast GC+concurrency+types verification 2018-05-08 21:15:48 +00:00
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.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: update email address 2018-04-14 19:28:37 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS C: add Iskander Sharipov's individual CLA mail 2018-04-16 04:49:46 +00:00
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