修复空指针异常

src/main/java/com/genersoft/iot/vmp/media/zlm/ZLMMediaNodeServerService.java

@@ -180,7 +180,7 @@ public class ZLMMediaNodeServerService implements IMediaNodeServerService {
             if (mediaList.getInteger("code") == 0) {
                 JSONArray data = mediaList.getJSONArray("data");
                 if (data == null) {
-                    return null;
+                    return streamInfoList;
                 }
                 JSONObject mediaJSON = data.getJSONObject(0);
                 MediaInfo mediaInfo = MediaInfo.getInstance(mediaJSON, mediaServer, userSetting.getServerId());

src/main/java/com/genersoft/iot/vmp/streamPush/bean/StreamPush.java

@@ -84,7 +84,7 @@ public class StreamPush extends CommonGBChannel implements Comparable<StreamPush
                 - DateUtil.yyyy_MM_dd_HH_mm_ssToTimestamp(streamPushItem.getCreateTime())).intValue();
     }
 
-    public StreamPush getInstance(StreamInfo streamInfo) {
+    public static StreamPush getInstance(StreamInfo streamInfo) {
         StreamPush streamPush = new StreamPush();
         streamPush.setApp(streamInfo.getApp());
         if (streamInfo.getMediaServer() != null) {

src/main/java/com/genersoft/iot/vmp/streamPush/service/impl/StreamPushServiceImpl.java

@@ -535,7 +535,7 @@ public class StreamPushServiceImpl implements IStreamPushService {
                 String key = streamInfo.getApp() + "_" + streamInfo.getStream();
                 StreamPush streamPushItem = result.get(key);
                 if (streamPushItem == null) {
-                    streamPushItem = streamPushItem.getInstance(streamInfo);
+                    streamPushItem = StreamPush.getInstance(streamInfo);
                     result.put(key, streamPushItem);
                 }
             }