Fix new tab bug

[kburk1997]

When viewing the binder, you can't create a new tab

Error message:

ActionController::UnknownFormat in TabsController#new
ActionController::UnknownFormat

Extracted source (around line #17):
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  def new
    @tab = Tab.new
    respond_with(@tab)
  end

  def edit

[kburk1997]

This bug has been fixed, as have been various other bugs!