handle default project that can appear via Welcome Screen | Settings

platform/lang-impl/src/com/intellij/refactoring/copy/CopyFilesOrDirectoriesHandler.java

@@ -80,7 +80,7 @@ public class CopyFilesOrDirectoriesHandler extends CopyHandlerDelegateBase {
   private static PsiDirectory tryNotNullizeDirectory(@NotNull Project project, @Nullable PsiDirectory defaultTargetDirectory) {
     if (defaultTargetDirectory == null) {
       VirtualFile root = FileChooserUtil.getLastOpenedFile(project);
-      if (root == null) root = ProjectUtil.guessProjectDir(project);
+      if (root == null) root = project.isDefault() ? null : ProjectUtil.guessProjectDir(project);
       if (root == null) root = VfsUtil.getUserHomeDir();
       defaultTargetDirectory = root == null ? null :
                                root.isDirectory() ? PsiManager.getInstance(project).findDirectory(root) :

platform/platform-impl/src/com/intellij/openapi/fileChooser/impl/FileChooserUtil.java

@@ -54,7 +54,7 @@ public final class FileChooserUtil {
     VirtualFile result;
 
     if (toSelect == null && lastPath == null) {
-      result = project == null ? null : ProjectUtil.guessProjectDir(project);
+      result = project == null || project.isDefault() ? null : ProjectUtil.guessProjectDir(project);
     }
     else if (toSelect != null && lastPath != null) {
       if (Boolean.TRUE.equals(descriptor.getUserData(PathChooserDialog.PREFER_LAST_OVER_EXPLICIT))) {