Update Background_substraction.py

Background_substraction.py

@@ -111,7 +111,11 @@ print('metadata_images_dir :', metadata_images_dir)
 # ### II.3.1. METADATA
 
 # In[9]:
-
+if not os.path.exists(base_dir):
+    print("WARNING: Could not find desired file: "+filename)
+else :
+    print("The",filename,"file was imported for further analysis!")
+    
 
 # Import all metadata we need from the QC/EDA chapter