Check if it has to be possible to update hardware (JSONs, DC). If yes, then exit().

UpdatePTUDevCtrl/main.cpp

@@ -130,8 +130,10 @@ int main(int argc, char *argv[]) {
     if (!QDir(plugInDir).exists()) {
         qCritical() << plugInDir
                     << "does not exists, but has to contain dc-library";
+        if (noUpdatePsaHardware == false) {
             exit(-1);
         }
+    }
 
     // before loading the library, delete all possible shared memory segments
 #if defined Q_OS_LINUX || defined Q_OS_UNIX