artresizer: make import conditional

Author: Serene-Arc

beets/util/artresizer.py

@@ -22,13 +22,15 @@
 import re
 import subprocess
 from itertools import chain
-from typing import AnyStr, Tuple, Optional, Mapping, Union
-from PIL import Image
+from typing import AnyStr, Tuple, Optional, Mapping, Union, TYPE_CHECKING
 from urllib.parse import urlencode
 
 from beets import logging, util
 from beets.util import displayable_path, get_temp_filename, syspath
 
+if TYPE_CHECKING:
+    from PIL import Image
+
 PROXY_URL = "https://images.weserv.nl/"
 
 log = logging.getLogger("beets")