if (! setter.exists())
if (setter == null || ! setter.exists())
	private String getRenameSetterLabel(){		String defaultLabel= RefactoringMessages.getString("RenameFiledInputWizardPage.rename_setter"); //$NON-NLS-1$		if (fSetterRenamingErrorMessage != null)			return constructDisabledSetterRenamingLabel(defaultLabel);		try {			IMethod	setter= getRenameFieldRefactoring().getSetter();			if (! setter.exists())				return defaultLabel;			String setterSig= JavaElementUtil.createMethodSignature(setter);			return RefactoringMessages.getFormattedString("RenameFiledInputWizardPage.rename_setter_to", new String[]{setterSig, createNewSetterName()});//$NON-NLS-1$		} catch(JavaModelException e) {			JavaPlugin.log(e);			return defaultLabel;					}	}