Updated the HDA example exercise and solution

idaes_examples/mod/tut/visualizer_tutorial.py

@@ -48,6 +48,8 @@
 
 from idaes.models.unit_models.pressure_changer import ThermodynamicAssumption
 from idaes.core.util.model_statistics import degrees_of_freedom
+from idaes.core.solvers import get_solver
+from idaes.core.util.exceptions import InitializationError
 
 try:
     import idaes_ui
@@ -289,7 +291,13 @@ def initialize_model(m: ConcreteModel) -> ConcreteModel:
     seq.set_guesses_for(m.fs.H101.inlet, tear_guesses)
 
     def initialize_unit(unit):
-        unit.initialize(outlvl=idaeslog.DEBUG)
+        try:
+            initializer = unit.default_initializer()
+            initializer.initialize(unit, output_level=idaeslog.INFO)
+        except InitializationError:
+            solver=get_solver()
+            solver.solve(unit)
+
 
     seq.run(m, initialize_unit)
     return m