fix device cuda if available

app.py

@@ -1,10 +1,10 @@
 import PIL.Image
 import gradio as gr
-
+import torch
 import numpy as np
 from craft_text_detector import Craft
 
-craft = Craft(output_dir='output', crop_type="box", cuda=True, export_extra=True)
+craft = Craft(output_dir='output', crop_type="box", cuda=torch.cuda.is_available(), export_extra=True)
 
 dw=0.3
 dh=0.25
@@ -51,7 +51,7 @@ def detect(image: PIL.Image.Image):
 
 def process(image:PIL.Image.Image):
     if image is None:
-        return None,0
+        return None,0,False
     boxes,signed = detect( image)
     annotated = PIL.Image.open('output/image_text_detection.png') # image with boxes displayed
     return annotated, len(boxes), signed