#18 File upload in certain folders

* adds try-except for removing folders in case of non existence or changed folder names on the hard drive

ema/models.py

@@ -142,4 +142,8 @@ class EmaDocument(AbstractDocument):
 
         # If a folder path has been set, we need to delete the whole folder!
         if folder_path is not None:
-            shutil.rmtree(folder_path)
+            try:
+                shutil.rmtree(folder_path)
+            except FileNotFoundError:
+                # Folder seems to be missing already...
+                pass