RFR 8196298 Add null Reader and Writer with latest changes

[Patrick Reinhart]

I applied those changes here:

http://cr.openjdk.java.net/~reinhapa/reviews/8196298/webrev.02

-Patrick


> Am 06.03.2018 um 23:12 schrieb Brian Burkhalter <brian.burkhalter at oracle.com>:
> 
> Yes, I think so and and also the parameter ‘csq' is allowed to be null so Objects.requireNonNull(csq) should be removed at lines 100 and 107 as no NPE is specified for these methods [1, 2].
> 
> Thanks,
> 
> Brian
> 
> [1] https://download.java.net/java/jdk10/docs/api/java/io/Writer.html#append(java.lang.CharSequence)
> [2] https://download.java.net/java/jdk10/docs/api/java/io/Writer.html#append(java.lang.CharSequence,int,int)
> 
> On Mar 6, 2018, at 11:49 AM, Bernd Eckenfels <ecki at zusammenkunft.net> wrote:
> 
>> Just a nit, Should append(CharSequence,int,int) also use checkFromIndexSize?
>