Bug 255172 [Import/Export] Warning message in the import wizard is not so helpful
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardProjectsImportPage.java
}
					} else {
						monitor.worked(60);
					}
					monitor.done();
				}
			});
		} catch (InvocationTargetException e) {
			IDEWorkbenchPlugin.log(e.getMessage(), e);
		} catch (InterruptedException e) {
			
		}
		projectsList.refresh(true);
		projectsList.setCheckedElements(getValidProjects());
		if (getValidProjects().length < selectedProjects.length) {
			setMessage(
					DataTransferMessages.WizardProjectsImportPage_projectsInWorkspace,
					WARNING);
		} else {
			setMessage(DataTransferMessages.WizardProjectsImportPage_ImportProjectsDescription);
		}
		setPageComplete(projectsList.getCheckedElements().length > 0);
	}
	/**
	 * Answer a handle to the zip file currently specified as being the source.
	 * Return null if this file does not exist or is not of valid format.
	 */
	private ZipFile getSpecifiedZipSourceFile(String fileName) {
		if (fileName.length() == 0) {
			return null;