- Some fixes

Author: Aliaksandr.Shpak

src/main/scala/devtools/kafka_data_viewer/ui/KafkaUiComponents.scala

@@ -47,7 +47,7 @@ class PreFilterPane[T](val layoutData: String,
         filters << filters.value.filterNot(_._1.value == name)
 
     override def content(): UiWidget = UiPanel(layoutData, Grid(), items = Seq(
-        UiLabel("growx", text = just("Pre-filter\n - type name to save\n - select from list to use")),
+        UiLabel("growx", text = just("Pre-filter (type name to save, select from list to use)")),
         UiPanel("growx", Grid("cols 3,margin 2"), items = Seq(
             UiCombo("growx", text = currentName, selection = filterSelected, items = shownFilters),
             UiButton(text = "Save", onAction = onSave, disabled = allowActions.map(!_)),

src/main/scala/devtools/lib/rxui/FxRender.scala

@@ -292,7 +292,7 @@ object FxRender {
             }
 
             for (handler <- tableModel.onDblClick) tableView.setOnMouseClicked((event: MouseEvent) =>
-                if (event.getClickCount == 2 && event.getButton == MouseButton.PRIMARY)
+                if (event.getClickCount == 2 && event.getButton == MouseButton.PRIMARY && tableView.getSelectionModel.getSelectedItem != null)
                     handler(tableView.getSelectionModel.getSelectedItem))
 
             def menuToItems(parent: ContextMenu)(itemModel: UiMenuItem): MenuItem =