Update pushStatusHandler.js

[flovilmart]

Fixes #1526

Some push adapters just resolve promises as is, just let them go through.

[codecov-io]

Current coverage is 92.93%

Merging #1543 into master will increase coverage by +0.02% as of 48a12cd

@@            master   #1543   diff @@
======================================
  Files           87      87       
  Stmts         5494    5494       
  Branches      1021    1021       
  Methods          0       0       
======================================
+ Hit           5105    5106     +1
  Partial          9       9       
+ Missed         380     379     -1

Review entire Coverage Diff as of 48a12cd

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