T4CSS fails to parse expressions

[eugbaranov]

.css generation fails (writing 'System.ArgumentNullException: Value cannot be null...' instead of styles) when .less file contain Java expressions.

Source .less file: #head { width: expression(document.body.clientWidth < "780px" ? "780px" : "100%"); }

Generated ,css file: System.ArgumentNullException: Value cannot be null. Parameter name: css at Yahoo.Yui.Compressor.YUICompressor.Compress(String css, Int32 columnWidth) at Yahoo.Yui.Compressor.CssCompressor.Compress(String css, Int32 columnWidth, CssCompressionType cssCompressionType) at Yahoo.Yui.Compressor.CssCompressor.Compress(String css) at dotless.Core.MinifierDecorator.TransformToCss(LessSourceObject source) at Microsoft.VisualStudio.TextTemplatingA14AB29D2C5760BEF500D59E7A32A163.GeneratedTextTransformation.TransformText()