fixed a bug

cdplib/pipeline_selector/PipelineSelector.py

@@ -155,6 +155,14 @@ class PipelineSelector(ABC):
 
                 with open(self.trials_path, "rb") as f:
                     self._trials = pickle.load(f)
+                    
+                if len(self._trials) == 0:
+                    self._trials = None
+                    
+            else:
+                self._trials = None
+                
+            if self._trials is not None:
 
                 self._start_iteration = self.number_of_trials