doc: comment why show winners can be true even if there may not be an…

…y winners

src/ofApp.cpp

@@ -158,6 +158,8 @@ void ofApp::urlResponse(ofHttpResponse & response) {
             std::smatch match = *i;
             winners += match.str() + " ";
         }
+        // if there are no winners this will show a blank screen
+        // allowing the game master to retry getting the winners
         showWinners = true;
     } else {
         ofRemoveAllURLRequests();