Проверка на наличие элемента

from PyQt5 import QtCore, QtWidgets
 
class Ui_MainWindow():
 
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(349, 387)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.centralwidget)
        self.verticalLayout.setObjectName("verticalLayout")
        self.listWidget = QtWidgets.QListWidget(self.centralwidget)
        self.listWidget.setObjectName("listWidget")
        self.verticalLayout.addWidget(self.listWidget)
        self.btn_delete = QtWidgets.QPushButton(self.centralwidget)
        self.btn_delete.setObjectName("btn_delete")
        self.verticalLayout.addWidget(self.btn_delete)
        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
 
        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)
 
    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.btn_delete.setText(_translate("MainWindow", "Удалить"))
 
        # Логика программы
        self.btn_delete.clicked.connect(self.del_current_item)
 
        self.listWidget.addItem('Привет, мир!1')
        self.listWidget.addItem('Привет, мир!2')
        self.listWidget.addItem('Привет, мир!3')
 
    def del_current_item(self):
        item = self.listWidget.currentItem()
        self.listWidget.takeItem(self.listWidget.row(item))
 
 
if __name__ == "__main__":
    import sys
 
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())

if self.listWidget.selectedItems():
            item = self.listWidget.currentItem()
            self.listWidget.takeItem(self.listWidget.row(item))