Issue Summary

When we add a Table from the drop down option in the visual mode while updating any issue field (be it comments section) , It adds an extra line after the table and and if we delete the table again in the visual mode, the extra line doesn't go away and it gives a drop down option with nothing listed. 

Environment

Issue reproducible in 7.6.6 and 7.6.9

Steps to Reproduce

1. Add a simple text custom field which has Wiki Renderer.
2. Add the custom field to all the screens including edit issue screen.
3. Open any issue from a project. 
4. Click on Edit issue
5. You should be able to see the custom field where you can input anything either in Visual mode or in Text mode
6. Stay on Visual mode and click on drop down box to create a table
7. Save it. 
8. Now click on the edit issue again and in visual mode, delete the table by selecting delete table from the options that you get when you click inside the table
9. You will see that it has not removed the extra space and instead leaved behind a expand or a drop down menu
10. This behaviour is not seen when adding and removing table from Text mode. 

Expected Results

Expected Results, is that when we remove a table from visual section, it should also remove the extra line that it inserted when adding the table.

Workaround

Two Workarounds available :

1) Remove the table from Visual Section and then remove the extra line from text mode. 

2) do a CTL+A (select all) in the visual mode and delete the whole table which also works at the customer side.