skip generating compiled files with first line empty to properly load sourcemap

[smahelos]

Hallo,

I had problem to load sourcemap with compiled files. Problem was that files are generated with first line empty.
I made small change in compiler.php on line 163:
From:
// load content $content = ''; foreach ($files as $file) { $content .= PHP_EOL . $this->loadFile($file); }

To:
// load content $content = ''; foreach ($files as $file) { if ($content !== '') { $content .= PHP_EOL; } $content .= $this->loadFile($file); }