Fix IndexError in extract_package_name on malformed import lines

autoflake.py

@@ -261,7 +261,10 @@ def extract_package_name(line: str) -> str | None:
     assert ";" not in line
 
     if line.lstrip().startswith(("import", "from")):
-        word = line.split()[1]
+        parts = line.split()
+        if len(parts) < 2:
+            return None
+        word = parts[1]
     else:
         # Ignore doctests.
         return None

test_autoflake.py

@@ -79,6 +79,9 @@ def test_extract_package_name(self) -> None:
             autoflake.extract_package_name("import os.path"),
         )
 
+    def test_extract_package_name_with_incomplete_import(self) -> None:
+        self.assertIsNone(autoflake.extract_package_name("import"))
+
     def test_extract_package_name_should_ignore_doctest_for_now(self) -> None:
         self.assertFalse(autoflake.extract_package_name(">>> import os"))
 
@@ -980,6 +983,10 @@ def test_fix_code_with_empty_string(self) -> None:
             autoflake.fix_code(""),
         )
 
+    def test_fix_code_with_carriage_return_in_import(self) -> None:
+        """Should not crash on import lines corrupted by carriage returns."""
+        autoflake.fix_code("import t\rs\nimport test\nimport0")
+
     def test_fix_code_with_from_and_as_and_escaped_newline(self) -> None:
         """Make sure stuff after escaped newline is not lost."""
         result = autoflake.fix_code(