feat: add an empty slot (#398)

Co-authored-by: Guillaume Chau <[email protected]>

Author: dclause

README.md

@@ -219,6 +219,7 @@ When the user scrolls inside RecycleScroller, the views are mostly just moved ar
   <slot name="before"></slot>
   <wrapper>
     <!-- Reused view pools here -->
+    <slot name="empty"></slot>
   </wrapper>
   <slot name="after"></slot>
 </main>

src/components/DynamicScroller.vue

@@ -28,6 +28,9 @@
     <template slot="after">
       <slot name="after" />
     </template>
+    <template slot="empty">
+      <slot name="empty" />
+    </template>
   </RecycleScroller>
 </template>
 

src/components/RecycleScroller.vue

@@ -47,6 +47,10 @@
           :active="view.nr.used"
         />
       </component>
+
+      <slot
+        name="empty"
+      />
     </component>
 
     <div