Kill EditorView::isAlive and just tunnel to the model where it was used

src/editor-view.coffee

@@ -217,8 +217,6 @@ class EditorView extends View
       do (name, method) =>
         @command name, (e) => method.call(this, e); false
 
-  isAlive: -> @editor?.isAlive()
-
   # {Delegates to: Editor.getCursor}
   getCursor: -> @editor.getCursor()
 

src/gutter.coffee

@@ -230,7 +230,7 @@ class Gutter extends View
       @highlightedLineNumbers.push(highlightedLineNumber)
 
   highlightLines: ->
-    return unless @getEditorView().isAlive()
+    return unless @getEditorView().editor?.isAlive()
 
     if @getEditorView().getSelection().isEmpty()
       row = @getEditorView().getCursorScreenPosition().row