Handle exception chain on addon boot (#2063)

* Handle exception chain on addon boot

* fix import

* Add tests

tests/utils/test_exception_helper.py

@@ -0,0 +1,36 @@
+"""Test exception helpers."""
+
+from supervisor.utils import check_exception_chain
+
+
+def test_simple_chain_exception():
+    """Test simple chain of excepiton."""
+
+    try:
+        raise ValueError()
+    except ValueError as err:
+        assert check_exception_chain(err, ValueError)
+
+
+def test_simple_nested_chain_exception():
+    """Test simple nested chain of excepiton."""
+
+    try:
+        try:
+            raise ValueError()
+        except ValueError as err:
+            raise KeyError() from err
+    except KeyError as err:
+        assert check_exception_chain(err, ValueError)
+
+
+def test_list_nested_chain_exception():
+    """Test list nested chain of excepiton."""
+
+    try:
+        try:
+            raise ValueError()
+        except ValueError as err:
+            raise KeyError() from err
+    except KeyError as err:
+        assert check_exception_chain(err, (ValueError, OSError))