Adding in check for no such file

daggyd/daggyd/daggyd.cpp

@@ -246,6 +246,10 @@ int main(int argc, char **argv)
 
   rj::Document doc;
   if (!configFile.empty()) {
+    if (!fs::exists(configFile)) {
+      std::cerr << "No such file " << configFile << std::endl;
+      exit(1);
+    }
     std::ifstream ifh(configFile);
     std::string config;
     std::getline(ifh, config, '\0');