Fixes for Droplet Activity

[aggarwalpulkit596]

Fix #93 Annotated Response with @Nonull and checking whether the response is successful or not and response body is not null

[codecov[bot]]

Codecov Report

Merging #94 into master will decrease coverage by 0.67%. The diff coverage is 55.55%.

@@             Coverage Diff              @@
##             master      #94      +/-   ##
============================================
- Coverage     27.51%   26.83%   -0.68%     
  Complexity       33       33              
============================================
  Files            83       83              
  Lines          1872     1867       -5     
  Branches         94       93       -1     
============================================
- Hits            515      501      -14     
- Misses         1320     1328       +8     
- Partials         37       38       +1

Impacted Files	Coverage Δ	Complexity Δ
...sc/digitaloceanapp/activities/DropletActivity.java	56.41% <55.55%> (-9.17%)	0 <0> (ø)

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[aggarwalpulkit596]

@the-dagger kindly check travis and fix is #97

[aggarwalpulkit596]

@championswimmer kindly review