Fix false-positive for TRY302 if exception cause is given (#4559)

crates/ruff/resources/test/fixtures/tryceratops/TRY302.py

@@ -68,6 +68,18 @@ def bad():
     except Exception as e:
         raise e
 
+def fine():
+    try:
+        process()
+    except Exception as e:
+        raise e from None
+
+def fine():
+    try:
+        process()
+    except Exception as e:
+        raise e from Exception
+
 def fine():
     try:
         process()

crates/ruff/src/rules/tryceratops/rules/useless_try_except.rs

@@ -44,7 +44,7 @@ pub(crate) fn useless_try_except(checker: &mut Checker, handlers: &[Excepthandle
         .iter()
         .map(|handler| {
             let ExceptHandler(ExcepthandlerExceptHandler { name, body, .. }) = handler;
-            let Some(Stmt::Raise(ast::StmtRaise {  exc, .. })) = &body.first() else {
+            let Some(Stmt::Raise(ast::StmtRaise {  exc, cause: None, .. })) = &body.first() else {
                 return None;
             };
             if let Some(expr) = exc {