resource为null时不设置标题

epublib/src/main/java/me/ag2s/epublib/domain/TitledResourceReference.java

@@ -1,12 +1,10 @@
 package me.ag2s.epublib.domain;
 
-import android.util.Log;
+import java.io.Serializable;
 
 import me.ag2s.epublib.Constants;
 import me.ag2s.epublib.util.StringUtil;
 
-import java.io.Serializable;
-
 public class TitledResourceReference extends ResourceReference
         implements Serializable {
 
@@ -74,8 +72,6 @@ public class TitledResourceReference extends ResourceReference
         //resource为null时不设置标题
         if(this.resource!=null&&this.title!=null){
             resource.setTitle(title);
-        }else {
-            Log.e(TitledResourceReference.class.getSimpleName(),"警告：resource 为null,忽略设置标题。");
         }
 
         return resource;