Added transtition_in for else in each block, and test

src/compiler/compile/render_dom/wrappers/EachBlock.ts

@@ -305,6 +305,7 @@ export default class EachBlockWrapper extends Wrapper {
 					} else if (!${this.vars.data_length}) {
 						${each_block_else} = ${this.else.block.name}(#ctx);
 						${each_block_else}.c();
+						@transition_in(${each_block_else}, 1);
 						${each_block_else}.m(${update_mount_node}, ${update_anchor_node});
 					} else if (${each_block_else}) {
 						${each_block_else}.d(1);
@@ -321,6 +322,7 @@ export default class EachBlockWrapper extends Wrapper {
 					} else if (!${each_block_else}) {
 						${each_block_else} = ${this.else.block.name}(#ctx);
 						${each_block_else}.c();
+						@transition_in(${each_block_else}, 1);
 						${each_block_else}.m(${update_mount_node}, ${update_anchor_node});
 					}
 				`);

test/runtime/samples/transitions-trigger-each-else-block/_config.js

@@ -0,0 +1,11 @@
+export default {
+	test({ component, target, assert, raf }) {
+		assert.htmlEqual(target.innerHTML, 'a');
+
+		component.arr = [];
+		assert.htmlEqual(target.innerHTML, '<div>empty</div>');
+
+		raf.tick(50);
+		assert.equal(target.querySelector("div").foo, 0.5);
+	},
+};

test/runtime/samples/transitions-trigger-each-else-block/main.svelte

@@ -0,0 +1,11 @@
+<script>
+   export let arr = ['a'];
+   function foo(node, params){
+        return { tick(t){ node.foo = t; }, duration: 100 }
+   }
+</script>
+{#each arr as v}
+    {v}
+    {:else}
+    <div transition:foo>empty</div>
+{/each}