Button Block: Only display buttons if the title attribute exists

[richtabor]

Describe the bug
Currently, a Button block without a title attribute still renders an empty button via the save function, leaving an empty <a> on the page.

To reproduce
Steps to reproduce the behavior:

1. Add an empty Button block
2. Publish the page
3. View the published page
4. See error

Expected behavior
A button is not rendered unless the title attribute is entered, preventing empty buttons from displaying if it's not intentionally configured within the editor.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: MacOS
• Browser: Safari
• Version: 12.1.1

Additional context
Using Gutenberg 6.3, although it happens regardless of whether or not the plugin is active.

[bobbingwide]

Problem still occurs when you add a new button to the buttons block with Gutenberg 7.2.0

[dgaik-gg]

What for example with arrow buttons where the arrow is added using a class and text is not necessary? Currently adding a space allows this button to be rendered but this is not a good way.

[getsource]

Hi @dgaik-gg!

Thanks much for the note about this!
Would you mind opening a new issue, to open discussion about the best way to address this?