StaticBlock renders empty in templates (#12425)

CHANGELOG.txt

@@ -128,6 +128,7 @@ Changelog
  * Add "soft" client-side validation for `StreamBlock` / `ListBlock` `min_num` / `max_num` (Matt Westcott)
  * Log accessibility checker results in the console to help developers with troubleshooting (Thibaud Colas)
  * Disable pointer events on checker highlights to simplify DevTools inspections (Thibaud Colas)
+ * `StaticBlock` now renders nothing by default when no template is specified (Sævar Öfjörð Magnússon)
  * Fix: Make `WAGTAILIMAGES_CHOOSER_PAGE_SIZE` setting functional again (Rohit Sharma)
  * Fix: Enable `richtext` template tag to convert lazy translation values (Benjamin Bach)
  * Fix: Ensure permission labels on group permissions page are translated where available (Matt Westcott)

docs/releases/6.3.md

@@ -71,6 +71,7 @@ This feature was developed by Bart Cieliński, alexkiro, and Sage Abdullah.
  * Prompt the user about unsaved changes when editing snippets (Sage Abdullah)
  * Add support for specifying different preview modes to the "View draft" URL for pages (Robin Varghese)
  * Implement new designs for the footer actions dropdown with more contrast and larger text (Sage Abdullah)
+ * `StaticBlock` now renders nothing by default when no template is specified (Sævar Öfjörð Magnússon)
 
 ### Bug fixes
 

wagtail/blocks/static_block.py

@@ -33,6 +33,9 @@ class StaticBlock(Block):
     def normalize(self, value):
         return None
 
+    def render_basic(self, value, context=None):
+        return ""
+
     class Meta:
         admin_text = None
         default = None

wagtail/tests/test_blocks.py

@@ -5015,6 +5015,11 @@ class TestStaticBlock(unittest.TestCase):
         result = block.render(None)
         self.assertEqual(result, "<p>PostsStaticBlock template</p>")
 
+    def test_render_without_template(self):
+        block = blocks.StaticBlock()
+        result = block.render(None)
+        self.assertEqual(result, "")
+
     def test_serialize(self):
         block = blocks.StaticBlock()
         result = block.get_prep_value(None)