Add indent block

Author: beat-buesser

art/metrics/verification_decisions_trees.py

@@ -204,10 +204,10 @@ def verify(
         :return: A tuple of the average robustness bound and the verification error at `eps`.
         """
         if np.min(x) < 0 or np.max(x) > 1:
-        raise ValueError(
-            "There are features not in the range [0, 1]. The current implementation only supports normalized input"
-            "values in range [0 1]."
-        )
+            raise ValueError(
+                "There are features not in the range [0, 1]. The current implementation only supports normalized input"
+                "values in range [0 1]."
+            )
 
         self.x: np.ndarray = x
         self.y: np.ndarray = check_and_transform_label_format(