increase test coverage, handle immediately-closed blocks

src/parse/state/mustache.ts

@@ -6,7 +6,7 @@ import { Parser } from '../index';
 import { Node } from '../../interfaces';
 
 function trimWhitespace(block: Node, trimBefore: boolean, trimAfter: boolean) {
-	if (!block.children) return; // AwaitBlock
+	if (!block.children || block.children.length === 0) return; // AwaitBlock
 
 	const firstChild = block.children[0];
 	const lastChild = block.children[block.children.length - 1];

test/validator/samples/empty-block-dev/input.html

@@ -1,3 +1,5 @@
 {{#each things as thing}}
 
-{{/each}}
+{{/each}}
+
+{{#each things as thing}}{{/each}}

test/validator/samples/empty-block-dev/warnings.json

@@ -1,8 +1,18 @@
-[{
+[
-	"message": "Empty block",
+	{
-	"loc": {
+		"message": "Empty block",
-		"line": 1,
+		"loc": {
-		"column": 0
+			"line": 1,
+			"column": 0
+		},
+		"pos": 0
 	},
-	"pos": 0
+	{
-}]
+		"message": "Empty block",
+		"loc": {
+			"line": 5,
+			"column": 0
+		},
+		"pos": 38
+	}
+]

test/validator/samples/empty-block-prod/input.html

@@ -1,3 +1,5 @@
 {{#each things as thing}}
 
-{{/each}}
+{{/each}}
+
+{{#each things as thing}}{{/each}}