added ValueError to load_file

utils/data_utils.py

@@ -211,7 +211,7 @@ def load_file_paths(data_directory, data_list, targets_directory=None):
         file_paths (list): List containing the input data and target labelled output data
 
     Raises:
-        None
+        ValueError: "Invalid data entry - check code and data entry format!"
     """
 
     if data_list:
@@ -222,8 +222,10 @@ def load_file_paths(data_directory, data_list, targets_directory=None):
 
     if targets_directory == None:
         file_paths = [[os.path.join(data_directory, volume)] for volume in volumes_to_be_used]
-    else:
+    elif:
         file_paths = [[os.path.join(data_directory, volume), os.join.path(targets_directory, volume)] for volume in volumes_to_be_used]
+    else:
+        raise ValueError("Invalid data entry - check code and data entry format!")
 
     return file_paths
 
@@ -341,6 +343,7 @@ def load_and_preprocess_evaluation(file_path, orientation, min_max=True):
 
     nifty_volume = nb.load(file_path[0])
 
+
 if __name__ == "__main__":
 
     folder_location = '/well/win-biobank/projects/imaging/data/data3/subjectsAll/'