test for is_nested failure

test/test_parser/test_representation.py

@@ -0,0 +1,7 @@
+from jedi.parser import Parser
+
+
+def test_import_is_nested():
+    imp = Parser('import ').module.imports[0]
+    # should not raise an error, even if it's not a complete import
+    assert not imp.is_nested()