Fixed another possible NullReferenceException in recent changes to the project browser.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@1052 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Base/Project/Src/Gui/Pads/ProjectBrowser/ProjectBrowserControl.cs

@@ -284,6 +284,9 @@ namespace ICSharpCode.SharpDevelop.Project
 		// derived from FindFileNode
 		ProjectNode FindProjectNodeByName(TreeNodeCollection nodes, string projectName)
 		{
+			if (nodes == null) {
+				return null;
+			}
 			ProjectNode pn;
 			foreach (TreeNode node in nodes) {
 				pn = node as ProjectNode;