fix(md-carousel-item): remove image if there is now image, #299

src/carousel/carousel-item.html

@@ -2,6 +2,6 @@
   <a if.bind="mdHref" href.bind="mdHref">
     <img if.bind="mdImage" src.bind="mdImage" />
   </a>
-  <img if.bind="!mdHref" src.bind="mdImage" />
+  <img if.bind="!mdHref && mdImage" src.bind="mdImage" />
   <slot></slot>
 </template>