Fix: --salt & --passwd parameters override were not correctly taken into account

server.js

@@ -127,7 +127,8 @@ function Server (dbConf, overrideConf) {
     logger.debug('Loading crypto functions...');
     // Extract key pair
     let keyPair = null;
-    if (!overrideConf.salt && !overrideConf.passwd && that.conf.pair) {
+    const keypairOverriden = overrideConf && (overrideConf.salt || overrideConf.passwd);
+    if (!keypairOverriden && that.conf.pair) {
       keyPair = keyring.Key(that.conf.pair.pub, that.conf.pair.sec);
     }
     else if (that.conf.passwd || that.conf.salt) {