Fixes #1444

[flovilmart]

Makes sure we have both parameters not undefined to make a call to bcrypt.compare, otherwise just consider the comparison to be unsuccessful

[codecov-io]

Current coverage is 92.79%

Merging #1451 into master will increase coverage by +0.02% as of b3e8e5a

@@            master   #1451   diff @@
======================================
  Files           87      87       
  Stmts         5483    5485     +2
  Branches      1012    1013     +1
  Methods          0       0       
======================================
+ Hit           5087    5090     +3
  Partial         10      10       
+ Missed         386     385     -1

Review entire Coverage Diff as of b3e8e5a

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