Merge branch 'dev_1.10.1' into development_issue_1630

Author: beat-buesser

art/attacks/evasion/adversarial_patch/adversarial_patch_pytorch.py

@@ -683,7 +683,10 @@ def apply_patch(
             mask = mask.copy()
         mask = self._check_mask(mask=mask, x=x)
         x_tensor = torch.Tensor(x)
-        mask_tensor = torch.Tensor(mask)
+        if mask is not None:
+            mask_tensor = torch.Tensor(mask)
+        else:
+            mask_tensor = None
         if isinstance(patch_external, np.ndarray):
             patch_tensor = torch.Tensor(patch_external)
         else: