make base64 work

hydra_node/sanitize.py

 from dotmap import DotMap
 import math
 from io import BytesIO
+import base64
 
 v1pp_defaults = {
     'steps': 50,
@@ -94,7 +95,11 @@ def sanitize_stable_diffusion(request):
 
     if request.image is not None:
         #decode from base64
-        request.image = request.image.decode('base64')
+        try:
+            request.image = base64.b64decode(request.image.encode('utf-8'))
+            
+        except Exception as e:
+            return False, "image is not valid base64"
         #check if image is valid
         try:
             from PIL import Image