Avoid excessive indentation in SignUtil

Better complies with our formatting standards.

src/com/massivecraft/massivecore/util/SignUtil.java

@@ -281,11 +281,9 @@ public class SignUtil
 		for (Block block : blocks)
 		{
 			List<String> lines = getLines(block);
-			if (lines != null)
-			{
+			if (lines == null) continue;
 			ret.addAll(lines);
 		}
-		}
 		
 		return ret;
 	}