Make the COMMUNITY tab process not infinitely loop

Related to https://github.com/Benjamin-Loison/YouTube-operational-API/issues/49

main.cpp

@@ -402,7 +402,7 @@ void treatChannelOrVideo(unsigned short threadId, bool isChannel, string id, str
                     }
                 }
             }
-            if(data.contains("nextPageToken"))
+            if(data.contains("nextPageToken") && data["nextPageToken"] != "")
             {
                 pageToken = data["nextPageToken"];
             }