Update app.py

app.py

@@ -70,8 +70,8 @@ def check_solarplant_broken(image):
 
 
 def greet(img):
-    boxes = license_plate_detect(img)
-    if boxes is not None:
+    lns = read_license_number(img)
+    if len(lns):
         # return (seg,
         return ("車牌： " + '; '.join(lns) + "\n\n" \
                 + "類型： "+ check_solarplant_installed_by_image(img, True) + "\n\n" \