handle no args properly

aider/main.py

@@ -6,7 +6,7 @@ from aider.coder import Coder
 
 
 def main(args=None):
-    if not args:
+    if args is None:
         args = sys.argv[1:]
 
     load_dotenv()

tests/test_main.py

@@ -13,7 +13,7 @@ class TestMain(TestCase):
             with open(os.devnull, "r") as dev_null:
                 save_stdin = sys.stdin
                 sys.stdin = dev_null
-                main()
+                main([])
                 sys.stdin = save_stdin
 
     def test_main_with_empty_dir_new_file(self):