add water entrainment even if no oil phase

[EvenSol]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 68.64407% with 37 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.35%. Comparing base (f322b9d) to head (7d21b1f).
⚠️ Report is 777 commits behind head on master.

Files with missing lines	Patch %	Lines
...thermodynamicoperations/flashops/TPmultiflash.java	80.00%	13 Missing and 4 partials ⚠️
...neqsim/thermo/mixingrule/EosMixingRuleHandler.java	0.00%	8 Missing ⚠️
...sim/thermo/mixingrule/EosMixingRulesInterface.java	0.00%	8 Missing ⚠️
...ocess/equipment/separator/ThreePhaseSeparator.java	76.47%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1529      +/-   ##
============================================
+ Coverage     46.31%   46.35%   +0.04%     
- Complexity     8245     8255      +10     
============================================
  Files           839      840       +1     
  Lines         80296    80395      +99     
  Branches       9884     9903      +19     
============================================
+ Hits          37190    37271      +81     
- Misses        40621    40637      +16     
- Partials       2485     2487       +2     

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