Missing disabling of format buttons in certain cases

[morpheus-87]

The format buttons for changing a text block to a heading or a quote block are even added to the format bar, when these blocktypes are not available by configuration.

[morpheus-87]

See this example:

My configuration is like this:

// Instantiate editor
window.editor = new SirTrevor.Editor({
  el: document.querySelector('.sir-trevor'),
  blockTypes: [
    "Heading",
    "Text",
    "List",
    "Image"
  ]
});

As you can see, the block type Quote is not enabled, but the format button, to convert a text block into a quote block, is though available. When I click on that button, the text simply disappears.