tiny fix (#147)

Co-authored-by: Keith Beattie <[email protected]>

Author: dallan-keylogic

idaes_examples/mod/hda/hda_ideal_VLE.py

@@ -550,7 +550,7 @@ def fix_initialization_states(blk):
 
         # Also need to deactivate sum of mole fraction constraint
         for k in blk.values():
-            if not k.config.defined_state:
+            if not k.config.defined_state and k.config.has_phase_equilibrium:
                 k.equilibrium_constraint.deactivate()