Add try/catch around json parser

As got:
```
terminate called after throwing an instance of 'nlohmann::detail::parse_error'
terminate called recursively
  what():  [json.exception.parse_error.101] parse error at line 1, column 1: syntax error while parsing value - unexpected end of input; expected '[', '{', or a literal
terminate called recursively
```

main.cpp

@@ -310,7 +310,16 @@ json getJson(unsigned short threadId, string url, string directoryPath)
     string finalUrl = "https://www.googleapis.com/youtube/v3/" + url + "&key=" + API_KEY;
 #endif
     string content = getHttps(finalUrl);
-    json data = json::parse(content);
+    json data;
+    try
+    {
+        data = json::parse(content);
+    }
+    catch (json::parse_error& ex)
+    {
+        PRINT(threadId, "Parse error for " << finalUrl << ", as got: " << content)
+        exit(1);
+    }
 
     ostringstream toString;
     toString << CHANNELS_DIRECTORY << directoryPath << "/" << requestsPerChannel << ".json";