[3.13] gh-122145: Handle an empty AST body when reporting tracebacks (GH-122161) (#124214)

gh-122145: Handle an empty AST body when reporting tracebacks (GH-122161)
(cherry picked from commit 5cd50cb6eb)

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>

Lib/traceback.py

@@ -698,6 +698,8 @@ class StackSummary(list):
         with suppress(SyntaxError, ImportError):
             import ast
             tree = ast.parse('\n'.join(all_lines))
+            if not tree.body:
+                return False
             statement = tree.body[0]
             value = None
             def _spawns_full_line(value):