Improve Bongacams online check

- check new (?) field isOnline before attempting to get stream sources (was failing due to missing json field when offline)

common/src/main/java/ctbrec/sites/bonga/BongaCamsModel.java

@@ -65,6 +65,13 @@ public class BongaCamsModel extends AbstractModel {
         String chatType = performerData.optString("showType");
         boolean isAway = performerData.optBoolean("isAway");
         
+        // looks like isOnline key is new. Treat it's absence as true (old behavior)
+        boolean jsonIsOnline = performerData.optBoolean("isOnline", true);
+
+        if (!jsonIsOnline) {
+            onlineState = OFFLINE;
+            online = false;
+        } else {
             onlineState = mapState(chatType);
             if (onlineState == ONLINE) {
                 if (isStreamAvailable()) {
@@ -81,6 +88,7 @@ public class BongaCamsModel extends AbstractModel {
             } else {
                 online = false;
             }
+        }
         return online;
     }