No empty logs and fixes some errors

application/api/image_processing.py

@@ -20,11 +20,15 @@ async def process_image(image: bytes) -> str:
         if r.boxes:
             for box in r.boxes:
                 cls_name = r.names[int(box.cls[0])]
-                if cls_name == "car":
+                if cls_name in ["car", "truck"]:
                     x1, y1, x2, y2 = map(int, box.xyxy[0])
                     size = (x2 - x1) ** 2 + (y2 - y1) ** 2
                     cars.append((size, (x1, y1, x2, y2)))
+        else:
+            return ""
 
+    if cars == []:
+        return ""
     # Get the biggest car box
     size, corners = max(cars, key=lambda x: x[0])
 
@@ -45,5 +49,7 @@ async def process_image(image: bytes) -> str:
                     lp_np = np.array(object=lp_img)
                     result = ocr_reader.readtext(image=lp_np)
                     print(result)
+        else:
+            return ""
 
     return str(result[0][1])  # type: ignore