Make 'core:close' destroy the pane itself if it is empty

src/workspace-view.coffee

@@ -44,7 +44,7 @@ class WorkspaceView extends View
   @delegatesProperty 'fullScreen', 'destroyedItemUris', toProperty: 'model'
   @delegatesMethods 'open', 'openSync', 'openSingletonSync', 'reopenItemSync',
     'saveActivePaneItem', 'saveActivePaneItemAs', 'saveAll', 'destroyActivePaneItem',
-    toProperty: 'model'
+    'destroyActivePane', toProperty: 'model'
 
   @version: 4
 
@@ -119,7 +119,7 @@ class WorkspaceView extends View
 
     @command 'pane:reopen-closed-item', => @reopenItemSync()
 
-    @command 'core:close', => @destroyActivePaneItem()
+    @command 'core:close', => if @getActivePaneItem()? then @destroyActivePaneItem() else @destroyActivePane()
     @command 'core:save', => @saveActivePaneItem()
     @command 'core:save-as', => @saveActivePaneItemAs()
 

src/workspace.coffee

@@ -132,6 +132,10 @@ class Workspace extends Model
   destroyActivePaneItem: ->
     @activePane?.destroyActiveItem()
 
+  # Public: destroy/close the active pane.
+  destroyActivePane: ->
+    @activePane?.destroy()
+
   # Private: Removes the item's uri from the list of potential items to reopen.
   itemOpened: (item) ->
     if uri = item.getUri?()