small layout fix for treeView component, substituted tabs with spaces in cycle...

small layout fix for treeView component, substituted tabs with spaces in cycle javascript files, added null checks for history event based tree node highlighting

modules/activiti-webapp-cycle/src/main/webapp/components/artifact/artifact.css

@@ -18,7 +18,9 @@
 }
 
 .artifact-code, .artifact-text-plain, .artifact-html {
-	margin: 1.2em;
+  background-color:#FFFFFF;
+  margin:0.5em;
+  padding:1.2em;
 }
 
 .artifact-html iframe, .artifact-html-reference iframe {

modules/activiti-webapp-cycle/src/main/webapp/components/fileChooser/fileChooser.css

+#fileChooserTree a:hover {
+  text-decoration: none;
+}
\ No newline at end of file

modules/activiti-webapp-cycle/src/main/webapp/components/tree/repo-tree.css

@@ -49,6 +49,10 @@
   text-decoration: none;
 }
 
+#treeDiv1 .ygtvcontent {
+  line-height:1.2em;
+}
+
 /* first or middle sibling, no children */
 .ygtvtn { background: url("/activiti-cycle/res/images/folder/tn.gif") 0 0 no-repeat; width:17px; height:22px; }
 

modules/activiti-webapp-cycle/src/main/webapp/components/tree/repo-tree.js

@@ -187,11 +187,10 @@
           }
           return false;
         });
-        var node = nodes[0];
 
-				if(node && (node != this._treeView.currentFocus) ) {
+        if(nodes && nodes[0] && (nodes[0] != this._treeView.currentFocus) ) {
           // if the node isn't already focused this is a browser history event and we manually set focus to the current node
-          node.focus();
+          nodes[0].focus();
         }
       }
     }