fix for empty dataclass

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [13.3.2] - Unreleased
+
+### Fixed
+
+- Fixed pretty printing of empty dataclass https://github.com/Textualize/rich/issues/2819
+
 ## [13.3.1] - 2023-01-28
 
 ### Fixed

rich/pretty.py

@@ -793,6 +793,7 @@ def traverse(
                     close_brace=")",
                     children=children,
                     last=root,
+                    empty=f"{obj.__class__.__name__}()",
                 )
 
                 for last, field in loop_last(

tests/test_pretty.py

@@ -175,6 +175,11 @@ class ExampleDataclass:
     last: int = field(default=1, repr=False)
 
 
+@dataclass
+class Empty:
+    pass
+
+
 def test_pretty_dataclass():
     dc = ExampleDataclass(1000, "Hello, World", 999, ["foo", "bar", "baz"])
     result = pretty_repr(dc, max_width=80)
@@ -195,6 +200,11 @@ def test_pretty_dataclass():
     assert result == "ExampleDataclass(foo=1000, bar=..., baz=['foo', 'bar', 'baz'])"
 
 
+def test_empty_dataclass():
+    assert pretty_repr(Empty()) == "Empty()"
+    assert pretty_repr([Empty()]) == "[Empty()]"
+
+
 class StockKeepingUnit(NamedTuple):
     name: str
     description: str