Fixed possibly-used-before-assignment by replacing flag variable

Author: aatle

pylint/checkers/refactoring/implicit_booleaness_checker.py

@@ -209,20 +209,17 @@ def _check_compare_to_str_or_zero(self, node: nodes.Compare) -> None:
                 continue
             op_1 = all_ops[ops_idx]
             op_3 = all_ops[ops_idx + 2]
-            error_detected = False
             if self.linter.is_message_enabled(
                 "use-implicit-booleaness-not-comparison-to-zero"
             ):
+                op = None
                 # 0 ?? X
                 if _is_constant_zero(op_1):
-                    error_detected = True
                     op = op_3
                 # X ?? 0
                 elif _is_constant_zero(op_3):
-                    error_detected = True
                     op = op_1
-                if error_detected:
-                    # pylint: disable=possibly-used-before-assignment
+                if op is not None:
                     original = f"{op_1.as_string()} {op_2} {op_3.as_string()}"
                     suggestion = (
                         op.as_string()
@@ -235,20 +232,17 @@ def _check_compare_to_str_or_zero(self, node: nodes.Compare) -> None:
                         node=node,
                         confidence=HIGH,
                     )
-                    error_detected = False
             if self.linter.is_message_enabled(
                 "use-implicit-booleaness-not-comparison-to-str"
             ):
-                node_name = ""
+                node_name = None
                 # x ?? ""
                 if utils.is_empty_str_literal(op_1):
-                    error_detected = True
                     node_name = op_3.as_string()
                 # '' ?? X
                 elif utils.is_empty_str_literal(op_3):
-                    error_detected = True
                     node_name = op_1.as_string()
-                if error_detected:
+                if node_name is not None:
                     suggestion = (
                         f"not {node_name}" if op_2 in {"==", "is"} else node_name
                     )