Fix wrong AST for empty style tag. (#69)

Author: ota-meshi

src/parser/converts/root.ts

@@ -109,7 +109,7 @@ export function convertSvelteRoot(
             },
         })
 
-        if (style.endTag) {
+        if (style.endTag && style.startTag.range[1] < style.endTag.range[0]) {
             const contentRange = {
                 start: style.startTag.range[1],
                 end: style.endTag.range[0],

tests/fixtures/parser/ast/empty-elements01-input.svelte

@@ -0,0 +1,3 @@
+<style src="./style.scss"></style>
+<div></div>
+<script></script>