fix type check

tests/unit_tests.py

@@ -483,6 +483,7 @@ def test_images():
     assert is_image_file('test.txt') is False
     assert is_image_file('test.jpg'*2000) is False  # length threshold
     # tag with attributes
+    assert handle_image(None) is None
     assert handle_image(html.fromstring('<img src="test.jpg"/>')) is not None
     assert handle_image(html.fromstring('<img data-src="test.jpg" alt="text" title="a title"/>')) is not None
     assert handle_image(html.fromstring('<img other="test.jpg"/>')) is None

trafilatura/main_extractor.py

@@ -444,6 +444,9 @@ def handle_table(table_elem: _Element, potential_tags: Set[str], options: Extrac
 
 def handle_image(element: Optional[_Element]) -> Optional[_Element]:
     "Process image elements and their relevant attributes."
+    if element is None:
+        return None
+
     processed_element = Element(element.tag)
 
     for attr in ("data-src", "src"):