if(!buffer.isEditable() || comment == null)
if(!buffer.isEditable() || comment == null || comment.length() == 0)
	public void blockComment()	{		String comment = (String)buffer.getProperty("blockComment");		if(!buffer.isEditable() || comment == null)		{			getToolkit().beep();			return;		}		comment = comment + ' ';		buffer.beginCompoundEdit();		try		{			for(int i = selectionStartLine; i <= selectionEndLine; i++)			{				buffer.insertString(getLineStartOffset(i),					comment,null);			}		}		catch(BadLocationException bl)		{			Log.log(Log.ERROR,this,bl);		}		finally		{			buffer.endCompoundEdit();		}		selectNone();	}