Cannot generate Code block preview.

Steps:

1. Go to Page.
2. Edit LP.
3. Add Code block.
4. Insert <p>lorem ipsum</p> into Content field.
5. Click Configure.

Actual: The preview doesn't show up.

Remarks:
ezsystems/ezplatform-page-builder dev-master be682dc eZ Platform Page Builder
ezsystems/landing-page-fieldtype-bundle dev-lp_v2 1582bcf eZ Platform Landing Page FieldTyp
ezsystems/ezplatform-admin-ui dev-master e567b17 eZ Platform Admin v2
ezsystems/ezplatform-admin-ui-modules dev-master 01fd289 External assets dependencies for EzPlatform AdminUI