dont indent empty lines in raw

Author: sinnbeck

README.md

@@ -106,7 +106,7 @@ use Sinnbeck\HtmlAst\Printer;
 echo Printer::make($nodes)->render(1);
 ```
 
-By default the output is indented with 4 spaces.
+By default, the output is indented with 4 spaces.
 This can be easily changed by calling `->withIndent()`
 ```php
 use Sinnbeck\HtmlAst\Printer;

src/Printer.php

@@ -145,7 +145,8 @@ protected function renderRaw(string $raw, int $level): string
                 $line = ltrim($line);
                 $first = false;
             }
-            $newLines[] = $baseIndent . $line;
+            $indent = $line ? $baseIndent : '';
+            $newLines[] = $indent . $line;
         }
 
         return implode($this->newline, $newLines) . $this->newline;

tests/fixtures/complex.html

@@ -22,5 +22,10 @@
                 <li>:phone:</li>
             </ul>
         </script>
+        <script>
+            var message = 'Hello World!';
+
+            alert(message);
+        </script>
     </body>
 </html>