[FIXED] [#1398] [4.1.0]Invalid CSS in classic theme

[moldeveloper]

Hi,
I found some problems in the classic theme css:

• in this case the url quotes are inside a "content:" and the string is invalid
  

  .x-cmd-slicer.x-progress-bar-default:before{display:none;content:"x-slicer:, bg:url("http://localhost:2265/extjs/packages/theme_classic/build/resources/images/progress/progress-default-bg-gif/ext.axd"), stretch:bottom" !important}

• in this snippet there is the invalid char '&', which I think is a missing expansion from SASS sources
  

  &.x-treelist-highlight-path .x-treelist-item-over > * > .x-treelist-item-icon{color:gray;transition:color 0.5s}&.x-treelist-highlight-path .x-treelist-item-over > * > .x-treelist-item-text{color:#000;transition:color 0.5s}&.x-treelist-highlight-path

  this seems present in the original files form extjs

I'm using RequestReduce that internally uses AjaxMin. The first problem is more serious, as it completely breaks the theme. At the moment i circumvented it modifying RequestReduce sources with a regex to substitute url(" ") with url(' ').