[30] Settings window - NoSuchElementException

[JaRutkowski]

Once the 'Settings' window is opened by one user, then an error occurs for other users when they are trying to open the 'Settings' window, with the following error:

Exception in thread "AWT-EventQueue-0" java.util.NoSuchElementException: No value present
	at java.base/java.util.Optional.get(Optional.java:141)
	at com.javafee.elibrary.core.common.Constants$Panel_Settings.getByName(Constants.java:36)
	at com.javafee.elibrary.core.settingsform.Actions.reloadContentPanel(Actions.java:55)
	at com.javafee.elibrary.core.settingsform.Actions.setFirstNodeSelectionInTreeMenu(Actions.java:146)
	at com.javafee.elibrary.core.settingsform.Actions.initializeForm(Actions.java:47)
	at com.javafee.elibrary.core.settingsform.Actions.control(Actions.java:20)
	at com.javafee.elibrary.core.tabbedform.Actions.openSettingsForm(Actions.java:264)
	at com.javafee.elibrary.core.tabbedform.Actions.onClickBtnSettings(Actions.java:241)
	at com.javafee.elibrary.core.tabbedform.Actions.lambda$control$2(Actions.java:32)
	at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
	at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
	at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)

Then, the user is not able to perform any actions on the window.

Additionally, for the super admin user below error occurred (after the 'Settings' window was closed), but was not reproduced again yet.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at com.javafee.elibrary.core.settingsform.Actions$1.windowClosed(Actions.java:29)
	at java.desktop/java.awt.AWTEventMulticaster.windowClosed(AWTEventMulticaster.java:368)
	at java.desktop/java.awt.AWTEventMulticaster.windowClosed(AWTEventMulticaster.java:367)
	at java.desktop/java.awt.AWTEventMulticaster.windowClosed(AWTEventMulticaster.java:367)
	at java.desktop/java.awt.Window.processWindowEvent(Window.java:2071)
	at java.desktop/javax.swing.JFrame.processWindowEvent(JFrame.java:298)

[AKepska]

Cannot reproduce the bug.