Don't try to show IContentLeadImage images, if theree none. Use the '…

…mini' scale as default scale for IContentLeadImage

docs/CHANGES.rst

@@ -4,6 +4,10 @@ Changelog
 1.2 (unreleased)
 ----------------
 
+- Don't try to show IContentLeadImage images, if theree none. Use the "mini"
+  scale as default scale for IContentLeadImage.
+  [thet]
+
 - Improve handling of Link types with other URL schemes than ``http://`` and
   ``https://``.
   [thet]

plone/app/contenttypes/behaviors/leadimage.pt

@@ -1,5 +1,6 @@
-<div class="leadImage"
-     tal:condition="view/available">
-  <img tal:define="scale context/@@images"
-       tal:replace="structure python: scale.scale('image', width=200, height=200).tag(css_class='newsImage')" />
-</div>
+<div class="leadImage" tal:condition="view/available">
+  <img tal:define="has_img context/image|nothing;
+                   scales context/@@images|nothing"
+       tal:condition="python:has_img and scales" 
+       tal:replace="structure python: scales.scale('image', scale='mini').tag(css_class='newsImage')" />
+</div>