Add another hasattr() check to b017 visit (#165)

* Add another hasattr() check to b017 visit
- Ensure we ignore nodes with no func

* Blacken b017.py

bugbear.py

@@ -439,7 +439,8 @@ def check_for_b017(self, node):
         item = node.items[0]
         item_context = item.context_expr
         if (
-            hasattr(item_context.func, "attr")
+            hasattr(item_context, "func")
+            and hasattr(item_context.func, "attr")  # noqa W503
             and item_context.func.attr == "assertRaises"  # noqa W503
             and len(item_context.args) == 1  # noqa W503
             and item_context.args[0].id == "Exception"  # noqa W503

tests/b017.py

@@ -5,6 +5,14 @@
 import unittest
 
 
+CONSTANT = True
+
+
+def something_else() -> None:
+    for i in (1, 2, 3):
+        print(i)
+
+
 class Foobar(unittest.TestCase):
     def evil_raises(self) -> None:
         with self.assertRaises(Exception):

tests/test_bugbear.py

@@ -210,7 +210,7 @@ def test_b017(self):
         filename = Path(__file__).absolute().parent / "b017.py"
         bbc = BugBearChecker(filename=str(filename))
         errors = list(bbc.run())
-        expected = self.errors(B017(10, 8))
+        expected = self.errors(B017(18, 8))
         self.assertEqual(errors, expected)
 
     def test_b301_b302_b305(self):