Error Checking for Optuna Integration (#217)

* Error Checking for Optuna Integration

Skips over interrupted trials

* Optuna Trials from Completed Trials

hiplot/experiment.py

@@ -515,10 +515,13 @@ def from_optuna(study: "optuna.study.Study") -> "Experiment":  # No type hint to
 
         # Create a list of dictionary objects using study trials
         # All parameters are taken using params.copy()
-
+        import optuna
+
         hyper_opt_data = []
-        for each_trial in study.trials:
+        for each_trial in study.get_trials(states=(optuna.trial.TrialState.COMPLETE, )):
             trial_params = {}
+            if not each_trial.values: # This checks if the trial was fully completed - the value will be None if the trial was interrupted halfway (e.g. via KeyboardInterrupt)
+                continue
             num_objectives = len(each_trial.values)
 
             if num_objectives == 1: