Only display tabs if there is a behavior element

I will do this.

This could be achievedd by creating the tabs in js and only do so conditionally.

Promoting since the ux sucks for cases without plugins.

+++ b/js/paragraphs.admin.js
@@ -29,6 +29,15 @@
+        $(context).find('.paragraphs-tabs-wrapper').find('.paragraphs-tabs').hide();
...
+        $(context).find('.paragraphs-tabs-wrapper').find('.paragraphs-tabs').show();

Additionally, i would think that by default CSS should hide it.

We need the show and hide in JS to respond to added / removed paragraphs?

In any case, i think the user journey hiding / showing the tabs should be described with test coverage.

+++ b/js/paragraphs.admin.js
@@ -29,6 +29,12 @@
+      if(document.getElementsByClassName('paragraphs-behavior').length != 0) {

We have jQuery. So why not $('.paragraphs-behavior')

IMHO we should do it the other way around, show the tab in css but hide it in js. I think that we should be able to test this with js tests if I am not mistaken.

@Primsi: The tabs should not be visible in NoJS. Also they should not be temporarily visible if the widget has no behavior tab.
I think the logic is correct to only add the tabs / make them visible if we detect a need for it.

+++ b/js/paragraphs.admin.js
@@ -29,6 +29,12 @@
+        $(context).find('.paragraphs-tabs-wrapper').find('.paragraphs-tabs').show();

Oh you dropped the hide() method here that was present before.
Unsure, but: Say a user removes all paragraphs and there are no behavior paragraphs remaining anymore, the tabs now still remains? Before it was removed again.

We need JS tests that proof the tabs are not present if there are is no behavior element.

Committed, thanks.