[Backport maintenance/4.0.x] Fix crash when a variable annotation is used as if test expression (#10729)

Fix crash when a variable annotation is used as `if` test expression (#10714)

Fix crash for ``consider-using-assignment-expr``.

(cherry picked from commit 926529b)

Co-authored-by: Zen Lee <[email protected]>

Author: pylint-backport[bot]

doc/whatsnew/fragments/10707.bugfix

@@ -0,0 +1,4 @@
+Fix crash for ``consider-using-assignment-expr`` when a variable annotation without assignment
+is used as the ``if`` test expression.
+
+Closes #10707

pylint/extensions/code_style.py

@@ -314,7 +314,7 @@ def _check_prev_sibling_to_if_stmt(
             case nodes.Assign(
                 targets=[nodes.AssignName(name=target_name)]
             ) | nodes.AnnAssign(target=nodes.AssignName(name=target_name)):
-                return target_name == name  # type: ignore[no-any-return]
+                return target_name == name and prev_sibling.value is not None
         return False
 
     @staticmethod

tests/functional/ext/code_style/cs_consider_using_assignment_expr.py

@@ -157,3 +157,8 @@ class A:
 A.var = 2
 if A.var:
     ...
+
+
+i: int
+if i:  # pylint: disable=used-before-assignment
+    pass