Update FormatterChain.java

[koebbingd]

Fix "index out of bounds" exception when calling chain.format(o) in Formatter implementation.

The next-method doesn't check the size of the formatter list at the moment.
This change just returns Formatter.NOOP when the end of the list is reached.

[jknack]

Looks good, but checkstyle isn't happy :)

[codecov-io]

Codecov Report

Merging #646 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #646      +/-   ##
============================================
+ Coverage     87.28%   87.29%   +<.01%     
- Complexity      833      834       +1     
============================================
  Files            78       78              
  Lines          2989     2991       +2     
  Branches        407      407              
============================================
+ Hits           2609     2611       +2     
  Misses          260      260              
  Partials        120      120

Impacted Files	Coverage Δ	Complexity Δ
...hub/jknack/handlebars/internal/FormatterChain.java	87.5% <100%> (+1.78%)	5 <2> (+1)	⬆️

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[coveralls]

Coverage increased (+0.006%) to 91.307% when pulling 47fafc0 on koebbingd:patch-1 into 3b702a4 on jknack:master.