Fixed bug when unpickling TIFF images

Author: radarhere

Tests/test_pickle.py

@@ -49,6 +49,7 @@ def helper_pickle_string(
         pytest.param(
             "Tests/images/hopper.webp", None, marks=skip_unless_feature("webp")
         ),
+        ("Tests/images/hopper.tif", None),
         ("Tests/images/test-card.png", None),
         ("Tests/images/zero_bb.png", None),
         ("Tests/images/zero_bb_scale2.png", None),

src/PIL/TiffImagePlugin.py

@@ -1066,7 +1066,7 @@ def tell(self):
         return self.__frame
 
     def load(self):
-        if self.use_load_libtiff:
+        if self.tile and self.use_load_libtiff:
             return self._load_libtiff()
         return super().load()
 
@@ -1094,12 +1094,7 @@ def _load_libtiff(self):
         """ Overload method triggered when we detect a compressed tiff
             Calls out to libtiff """
 
-        if self.tile is None:
-            raise OSError("cannot load this image")
-
-        pixel = Image.Image.load(self)
-        if not self.tile:
-            return pixel
+        Image.Image.load(self)
 
         self.load_prepare()