correctly handle empty <style> tag (#634)

src/generators/dom/index.ts

@@ -222,7 +222,7 @@ export default function dom(
 			this._yield = options._yield;
 
 			this._torndown = false;
-			${parsed.css &&
+			${generator.css &&
 				options.css !== false &&
 				`if ( !document.getElementById( ${JSON.stringify(
 					generator.cssId + '-style'

src/utils/deindent.ts

@@ -1,6 +1,6 @@
 const start = /\n(\t+)/;
 
-export default function deindent(strings: string[], ...values: any[]) {
+export default function deindent(strings: TemplateStringsArray, ...values: any[]) {
 	const indentation = start.exec(strings[0])[1];
 	const pattern = new RegExp(`^${indentation}`, 'gm');
 

test/runtime/samples/empty-style-block/_config.js

@@ -0,0 +1,3 @@
+export default {
+	html: '',
+};

test/runtime/samples/empty-style-block/main.html

@@ -0,0 +1 @@
+<style></style>