LibJS: Make the Function() constructor throw a SyntaxError, not return

Author: https://github.com/linusg
Commit: 7b8765c311
Pull-request: https://github.com/SerenityOS/serenity/pull/2209

Libraries/LibJS/Runtime/FunctionConstructor.cpp

@@ -71,7 +71,8 @@ Value FunctionConstructor::construct(Interpreter& interpreter)
     auto function_expression = parser.parse_function_node<FunctionExpression>();
     if (parser.has_errors()) {
         // FIXME: The parser should expose parsing error strings rather than just fprintf()'ing them
-        return Error::create(interpreter.global_object(), "SyntaxError", "");
+        interpreter.throw_exception<SyntaxError>("");
+        return {};
     }
     return function_expression->execute(interpreter);
 }