Fixed bug icsharpcode#674 Unhandled Exception when Moving Folder of Classes from Project A to Project B

Author: daniil-tr

src/Main/Base/Project/Src/Gui/Pads/ProjectBrowser/Commands/FolderNodeCommands.cs

@@ -80,6 +80,7 @@ public static void CopyDirectory(string directoryName, DirectoryNode node, bool
 			if (!FileUtility.IsEqualFileName(directoryName, copiedFileName)) {
 				if (includeInProject && ProjectService.OpenSolution != null) {
 					// get ProjectItems in source directory
+                    FileService.CopyFile(directoryName, copiedFileName, true, false);
 					foreach (IProject project in ProjectService.OpenSolution.Projects) {
 						if (!FileUtility.IsBaseDirectory(project.Directory, directoryName))
 							continue;
@@ -111,7 +112,6 @@ public static void CopyDirectory(string directoryName, DirectoryNode node, bool
 					}
 				}
 
-				FileService.CopyFile(directoryName, copiedFileName, true, false);
 				DirectoryNode newNode = new DirectoryNode(copiedFileName);
 				newNode.InsertSorted(node);
 				if (includeInProject) {