Fix ParseUserCurrentCoder bug

[natario1]

Fixes a bug that would make session token be JSONObject.NULL instead of null, causing #209 .

[jhansche]

Looks like another unit test is failing because of this now.

[codecov]

Codecov Report

Merging #724 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #724      +/-   ##
============================================
- Coverage        53%   52.98%   -0.02%     
+ Complexity     1732     1730       -2     
============================================
  Files           132      132              
  Lines         10266    10261       -5     
  Branches       1434     1433       -1     
============================================
- Hits           5441     5437       -4     
+ Misses         4376     4375       -1     
  Partials        449      449

Impacted Files	Coverage Δ	Complexity Δ
...src/main/java/com/parse/ParseUserCurrentCoder.java	80% <100%> (-1.09%)	9 <3> (-1)
.../src/main/java/com/parse/ParseEventuallyQueue.java	5.47% <0%> (-1.28%)	3% <0%> (ø)
...rse/src/main/java/com/parse/ParseInstallation.java	75.23% <0%> (-0.96%)	39% <0%> (-1%)
...se/src/main/java/com/parse/NotificationCompat.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
...ain/java/com/parse/ParsePushBroadcastReceiver.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
Parse/src/main/java/com/parse/Lists.java	90% <0%> (+8.18%)	1% <0%> (ø)	⬇️

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[rogerhu]

We have two ways of fixing this issue right?

https://github.com/parse-community/Parse-SDK-Android/pull/723/files

[natario1]

@rogerhu the second there will just hide the bug when present, this should actually go to the point and fix it.

I think we could merge this and then, if the bug is still present from some other source, consider the other

[rogerhu]

rebase

[natario1]

What's wrong with travis? We just merged a few comments. Tests pass on my machine.. 😕

[flovilmart]

There seems to be an issue in the ParseInstallationTests

[natario1]

Looks related to the travis worker time zone, let's see. It's strange that it showed up now