Replaced hasattr in dumps with supports_argument

tests/test_utils.py

@@ -0,0 +1,24 @@
+from typing import Callable
+
+import pytest
+
+from libbot._utils import supports_argument
+
+
+def func1(foo: str, bar: str):
+    pass
+
+
+def func2(foo: str):
+    pass
+
+
+@pytest.mark.parametrize(
+    "func, arg_name, result",
+    [
+        (func1, "foo", True),
+        (func2, "bar", False),
+    ],
+)
+def test_supports_argument(func: Callable, arg_name: str, result: bool):
+    assert supports_argument(func, arg_name) == result