Fix HelpFormatter.write_usage with empty args

src/click/formatting.py

@@ -63,7 +63,7 @@ def wrap_text(
         replace_whitespace=False,
     )
     if not preserve_paragraphs:
-        return wrapper.fill(text)
+        return wrapper.fill(text) if text else initial_indent
 
     p: list[tuple[int, bool, str]] = []
     buf: list[str] = []

tests/test_formatting.py

@@ -433,3 +433,10 @@ def test_help_formatter_write_text():
     actual = formatter.getvalue()
     expected = "  Lorem ipsum dolor sit amet,\n  consectetur adipiscing elit\n"
     assert actual == expected
+
+
+def test_help_formatter_write_usage_without_args():
+    f = click.HelpFormatter()
+    f.write_usage("Program")
+    expected = "Usage: Program \n"
+    assert f.getvalue() == expected