rem: if (path == "") return null; 
add: if (path == "" || path == null || path == "null") return null; 
context:    this.resolvePath = function(path) {      if (path == "") return null;      var x;      if (this.xpe) {         x = this.xpe.evaluate("." + path.replace(/\/(?!xrai:)/g,"/xraic:"), XRai.getRoot().parentNode, this.nsResolver, 0, null).iterateNext();         return x;      }      stack = path.split("/");      return this.resolvePathStep(XRai.getRoot(), stack, 1);   }
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