set correct color, disable button until new entry created

src/ui/newentry.py

@@ -9,7 +9,7 @@ class NewEntry(QtWidgets.QDialog, Ui_Dialog):
         super(NewEntry, self).__init__()
         self.setupUi(self)
         self.setWindowTitle("Neues Exemplar hinzufügen")
-        self.setWindowIcon(Icon("newentry").overwriteColor("#ffffff"))
+        self.setWindowIcon(Icon("newentry").icon)
         self.tableWidget.horizontalHeader().setSectionResizeMode(
             QtWidgets.QHeaderView.ResizeMode.Stretch
         )
@@ -19,8 +19,15 @@ class NewEntry(QtWidgets.QDialog, Ui_Dialog):
         self.populateTable()
         self.btn_addNewBook.clicked.connect(self.addEntry)
         self.buttonBox.accepted.connect(self.insertEntry)
+        #disable buttonbox accepted
+        self.buttonBox.button(
+            QtWidgets.QDialogButtonBox.StandardButton.Ok
+        ).setEnabled(False)
 
     def addEntry(self):
+        self.buttonBox.button(
+            QtWidgets.QDialogButtonBox.StandardButton.Ok
+        ).setEnabled(True)
         # clone last row and its data
         row = self.tableWidget.rowCount()
         self.tableWidget.insertRow(row)