Show sub label in debug view when available (#7567)

* Show sub label in debug view if available

* Ensure sub label is printable to be used

frigate/util/image.py

@@ -4,6 +4,7 @@ import datetime
 import logging
 from abc import ABC, abstractmethod
 from multiprocessing import shared_memory
+from string import printable
 from typing import AnyStr, Optional
 
 import cv2
@@ -154,6 +155,11 @@ def draw_box_with_label(
     )
 
 
+def is_label_printable(label) -> bool:
+    """Check if label is printable."""
+    return not bool(set(label) - set(printable))
+
+
 def calculate_region(frame_shape, xmin, ymin, xmax, ymax, model_size, multiplier=2):
     # size is the longest edge and divisible by 4
     size = int((max(xmax - xmin, ymax - ymin) * multiplier) // 4 * 4)