chatgui: validate config options on startup, refuse to start on errors

tools/chatgui/src/main.cpp

@@ -2,6 +2,7 @@
 #include <QPalette>
 #include <QStyleFactory>
 #include <QDir>
+#include <cstdio>
 #include "mainwindow.h"
 #include "../db/db_manager.h"
 #include "../transport/node_config.h"
@@ -45,6 +46,11 @@ int main(int argc, char *argv[]) {
             qCritical("Cannot open/read config file: %s", qPrintable(cfgPath));
             return 1;
         }
+        if (cfg.hasErrors()) {
+            for (const auto& err : cfg.errors())
+                fprintf(stderr, "CONFIG ERROR: %s\n", qPrintable(err));
+            return 1;
+        }
         if (cfg.privKey().length() != 64 || cfg.pubKey().length() != 64) {
             qWarning("Config: keys missing/invalid, regenerating identity");
             cfg.generateIdentity();