fix exception while reloading comboboxes and setting new values

=== error ===
java.lang.ArrayIndexOutOfBoundsException: 15
15
javax.swing.plaf.basic.BasicListUI.updateLayoutState(Unknown Source)
javax.swing.plaf.basic.BasicListUI.maybeUpdateLayoutState(Unknown
Source)
javax.swing.plaf.basic.BasicListUI$Handler.valueChanged(Unknown Source)
javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
javax.swing.DefaultListSelectionModel.fireValueChanged(Unknown Source)
javax.swing.DefaultListSelectionModel.changeSelection(Unknown Source)
javax.swing.DefaultListSelectionModel.changeSelection(Unknown Source)
javax.swing.DefaultListSelectionModel.setSelectionInterval(Unknown
Source)
javax.swing.JList.setSelectedIndex(Unknown Source)
javax.swing.plaf.basic.BasicComboPopup.setListSelection(Unknown Source)
javax.swing.plaf.basic.BasicComboPopup.access$300(Unknown Source)
javax.swing.plaf.basic.BasicComboPopup$Handler.itemStateChanged(Unknown
Source)
javax.swing.JComboBox.fireItemStateChanged(Unknown Source)
javax.swing.JComboBox.selectedItemChanged(Unknown Source)
javax.swing.JComboBox.contentsChanged(Unknown Source)
javax.swing.AbstractListModel.fireContentsChanged(Unknown Source)
javax.swing.DefaultComboBoxModel.setSelectedItem(Unknown Source)
javax.swing.JComboBox.setSelectedItem(Unknown Source)
lcmc.gui.widget.ComboBox.setValueAndWait0(ComboBox.java:329)
lcmc.gui.widget.Widget.setValueNoListeners(Widget.java:420)
lcmc.gui.resources.ServiceInfo.checkResourceFieldsChanged(ServiceInfo.java:560)