Allow for more than one empty buffer to be open

Closes #679

src/root-view.coffee

@@ -173,7 +173,8 @@ class RootView extends View
     initialLine = options.initialLine
     path = project.relativize(path)
     if activePane = @getActivePane()
-      editSession = activePane.itemForUri(path) ? project.open(path, {initialLine})
+      editSession = activePane.itemForUri(path)
+      editSession = project.open(path, {initialLine}) unless path and editSession
       activePane.showItem(editSession)
     else
       editSession = project.open(path, {initialLine})