Fix image input not having the right path on edit

canteeneo/views.py

@@ -162,8 +162,9 @@ def edit_dish(stall_id, dish_id):
             dish.name = form.name.data
             dish.description = form.description.data
             dish.price = form.price.data
-            dish.image_path = secure_filename(form.image.data.filename)
-            form.image.data.save(os.path.join(app.config['UPLOAD_FOLDER'], dish.image_path))
+            if form.image.data.filename is not u'':
+                dish.image_path = secure_filename(form.image.data.filename)
+                form.image.data.save(os.path.join(app.config['UPLOAD_FOLDER'], dish.image_path))
             db.session.commit()
             return redirect(url_for('stall', stall_id=stall_id))
         else: