Update for numpy array

fedot/core/data/data.py

@@ -817,15 +817,21 @@ def array_to_input_data(features_array: np.ndarray,
 
     categorical_features = None
     if categorical_idx is not None:
-        if isinstance(categorical_idx[0], str) and features_names is None:
-            raise
-        else:
-            categorical_idx = [i for i, column in enumerate(features_names) if column in set(categorical_idx)]
-
         if isinstance(categorical_idx, list):
             categorical_idx = np.array(categorical_idx)
 
-        categorical_features = features_array[:, categorical_idx]
+        if categorical_idx != np.array([]) and isinstance(categorical_idx[0], str) and features_names is None:
+            raise ValueError(
+                'Impossible to specify categorical features by name when the features_names are not specified'
+            )
+
+        if categorical_idx != np.array([]) and isinstance(categorical_idx[0], str):
+            categorical_idx = np.array(
+                [idx for idx, column in enumerate(features_names) if column in set(categorical_idx)]
+            )
+
+            if categorical_idx.size != 0:
+                categorical_features = features_array[:, categorical_idx]
 
     data = InputData(
         idx=idx,