To get this to work for the Collapsible rows you need to Edit main-product.liquid and put the condition inside ‘collapsible_tab’ case like so.

Follow this steps to hide the empty collapsible_tab

Step 1: Login into Shopify admin

Step 2: Go to Online store > Themes

Step 3: Then after click on Action > Edit code

Step 4: Search the main-product.liquid file in Sections

Step 5: Search the collapsible_tab section in liquid file

Then put this condition as per below image.

{%- if block.settings.content != blank or block.settings.page.content != blank -%}

…

{%- endif -%}