Fix one issue with media queries and detached rulesets, one to go

lib/less/tree/media.js

@@ -147,6 +147,8 @@ tree.Media.prototype = {
       }
     },
     bubbleSelectors: function (selectors) {
+      if (!selectors)
+        return;
       this.rules = [new(tree.Ruleset)(selectors.slice(0), [this.rules[0]])];
     }
 };

lib/less/tree/rule.js

@@ -2,7 +2,7 @@
 
 tree.Rule = function (name, value, important, merge, index, currentFileInfo, inline) {
     this.name = name;
-    this.value = (value instanceof tree.Value) ? value : new(tree.Value)([value]);
+    this.value = (value instanceof tree.Value || value instanceof tree.Ruleset) ? value : new(tree.Value)([value]);
     this.important = important ? ' ' + important.trim() : '';
     this.merge = merge;
     this.index = index;
@@ -46,7 +46,6 @@ tree.Rule.prototype = {
             evaldValue = this.value.eval(env);
             
             if (!this.variable && evaldValue.type === "Ruleset") {
-                console.log(this.index);
                 throw { message: "Rulesets cannot be evaluated on a property.",
                         index: this.index, filename: this.currentFileInfo.filename };
             }

test/css/detached-rulesets.css

@@ -45,3 +45,20 @@ html.lt-ie9 header {
 .without-mixins {
   b: 1;
 }
+@media (orientation: portrait) {
+  /*    .wrap-media-mixin({
+      @media tv {
+        .triple-wrapped-mq {
+          triple: true;
+        }
+      }
+    });*/
+}
+@media (orientation: portrait) and tv {
+  .my-selector {
+    background-color: black;
+  }
+}
+.a {
+  test: test;
+}

test/less/detached-rulesets.less

@@ -10,8 +10,8 @@
   .wrap-selector {
       @c: visible;
       @ruleset();
-	  visible-one: @b;
-	  visible-two: @c;
+      visible-one: @b;
+      visible-two: @c;
     }
 };
 
@@ -63,3 +63,40 @@ header {
 .without-mixins {
   @ruleset-2();
 }
+@my-ruleset: {
+    .my-selector {
+      @media tv {
+        background-color: black;
+      }
+    }
+  };
+@media (orientation:portrait) {
+    @my-ruleset();
+    // doesn't work yet
+/*    .wrap-media-mixin({
+      @media tv {
+        .triple-wrapped-mq {
+          triple: true;
+        }
+      }
+    });*/
+}
+.wrap-media-mixin(@ruleset) {
+  @media widescreen {
+    @media print {
+      @ruleset();
+    }
+    @ruleset();
+  }
+  @ruleset();
+}
+// unlocking mixins
+@my-mixins: {
+  .mixin() {
+    test: test;
+  }
+};
+@my-mixins();
+.a {
+  .mixin();
+}