Add unset TERM= to the "dumb" terminal ignore as well

Lib/_pyrepl/simple_interact.py

@@ -28,6 +28,7 @@
 import _sitebuiltins
 import linecache
 import functools
+import os
 import sys
 import code
 
@@ -50,7 +51,6 @@ def check() -> str:
     try:
         _get_reader()
     except _error as e:
-        import os  # temporary debugging measure to understand the Address sanitizer environment failure
         if term := os.environ.get("TERM", ""):
             term = f"; TERM={term}"
         return str(str(e) or repr(e) or "unknown error") + term

Lib/test/test_pyrepl/test_pyrepl.py

@@ -1054,6 +1054,7 @@ def test_bracketed_paste_single_line(self):
         output = multiline_input(reader)
         self.assertEqual(output, input_code)
 
+
 @skipUnless(pty, "requires pty")
 class TestDumbTerminal(ReplTestCase):
     def test_dumb_terminal_exits_cleanly(self):
@@ -1065,8 +1066,9 @@ def test_dumb_terminal_exits_cleanly(self):
         self.assertNotIn("Exception", output)
         self.assertNotIn("Traceback", output)
 
+
 @skipUnless(pty, "requires pty")
-@skipIf(os.environ.get("TERM") == "dumb", "can't use pyrepl in dumb terminal")
+@skipIf((os.environ.get("TERM") or "dumb") == "dumb", "can't use pyrepl in dumb terminal")
 class TestMain(ReplTestCase):
     def setUp(self):
         # Cleanup from PYTHON* variables to isolate from local