Python: Fixes bug in modernization

Author: BekaValentine

python/ql/src/Exceptions/RaisingTuple.ql

@@ -11,8 +11,9 @@
 
 import python
 
-from Raise r, AstNode origin
-where r.getException().pointsTo(_, ClassValue::tuple(), origin) and
+from Raise r, Value v, AstNode origin
+where r.getException().pointsTo(v, origin) and
+v.getClass() = ClassValue::tuple() and
 major_version() = 2 /* Raising a tuple is a type error in Python 3, so is handled by the IllegalRaise query. */
 
 select r, "Raising $@ will result in the first element (recursively) being raised and all other elements being discarded.", origin, "a tuple"