修复一点错误

src/main/java/org/sss/presentation/noui/cache/AbstractCache.java

@@ -29,7 +29,9 @@ public abstract class AbstractCache implements CacheController {
     public CacheList cacheRead(CacheKey cacheKey, long keepAlive, int maxSize, int offset) {
         Object o = cacheKey.getKey();
         String fullSizeKey = generateKey(o);
-        int fullSize = (int) doCacheRead(fullSizeKey);
+        Integer fullSize = (Integer) doCacheRead(fullSizeKey);
+        if(fullSize == null)
+            fullSize = 0;
         if (fullSize == 0) {
             try {
                 fullSize = cacheKey.getFullSize();