my.reddit: better handling for legacy reddit config

prior to this change it would error with

    @dataclass
>   class pushshift_config(uconfig.pushshift):
E   AttributeError: type object 'test_config' has no attribute 'pushshift'

my/reddit/pushshift.py

@@ -12,6 +12,9 @@ from my.core.common import Paths, Stats
 from dataclasses import dataclass
 from my.core.cfg import make_config
 
+# note: keeping pushshift import before config import, so it's handled gracefully by import_source
+from pushshift_comment_export.dal import read_file, PComment
+
 from my.config import reddit as uconfig
 
 @dataclass
@@ -29,7 +32,6 @@ from my.core import get_files
 from typing import Sequence, Iterator
 from pathlib import Path
 
-from pushshift_comment_export.dal import read_file, PComment
 
 
 def inputs() -> Sequence[Path]:

tests/reddit.py

@@ -11,6 +11,11 @@ def test_basic() -> None:
     assert len(list(saved())) > 0
 
 
+def test_comments() -> None:
+    from my.reddit.all import comments
+    assert len(list(comments())) > 0
+
+
 def test_unfav() -> None:
     from my.reddit import events, saved
     ev = events()