bpo-46434: Handle missing docstrings in pdb help (GH-30705)

(cherry picked from commit 60705cff70576482fea31dcafbf8a37cbb751ea5)

Co-authored-by: Tom Sparrow <793763+sparrowt@users.noreply.github.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/Lib/pdb.py b/Lib/pdb.py
index 9432111..7ab50b4 100755
--- a/Lib/pdb.py
+++ b/Lib/pdb.py
@@ -1493,6 +1493,9 @@ class Pdb(bdb.Bdb, cmd.Cmd):
                 self.error('No help for %r; please do not run Python with -OO '
                            'if you need command help' % arg)
                 return
+            if command.__doc__ is None:
+                self.error('No help for %r; __doc__ string missing' % arg)
+                return
             self.message(command.__doc__.rstrip())
 
     do_h = do_help