- fixed a small NPE in MD5CalculatingOutputStream

[yfarjoun]

see title

[codecov-io]

Codecov Report

Merging #881 into master will increase coverage by 0.009%.
The diff coverage is 0%.

@@               Coverage Diff               @@
##              master      #881       +/-   ##
===============================================
+ Coverage     65.025%   65.034%   +0.009%     
- Complexity      7235      7237        +2     
===============================================
  Files            528       528               
  Lines          31894     31894               
  Branches        5444      5444               
===============================================
+ Hits           20739     20742        +3     
+ Misses          9012      9010        -2     
+ Partials        2143      2142        -1

Impacted Files	Coverage Δ	Complexity Δ
...sjdk/samtools/util/Md5CalculatingOutputStream.java	76.923% <0%> (+5.128%)	9 <1> (+1)	⬆️
...a/htsjdk/samtools/cram/encoding/rans/Decoding.java	85.714% <0%> (+3.571%)	12% <0%> (+1%)	⬆️