modify the mark init

cat-client/src/main/java/com/dianping/cat/message/internal/MessageIdFactory.java

@@ -91,11 +91,15 @@ public class MessageIdFactory {
 		File mark = new File("/data/appdatas/cat/", "cat-" + domain + ".mark");
 
 		if (!mark.exists()) {
-			boolean success = mark.createNewFile();
-
+			boolean success = true;
+			try {
+				success = mark.createNewFile();
+			} catch (Exception e) {
+				success = false;
+			}
 			if (!success) {
 				String tmpDir = System.getProperty("java.io.tmpdir");
-				
+
 				mark = new File(tmpDir, "cat-" + domain + ".mark");
 			}
 		}