Fixed: Don't append empty login, password or shard ID to batch

--HG--
branch : develop

code/ryzom/client/src/login_patch.cpp

@@ -1029,13 +1029,21 @@ void CPatchManager::executeBatchFile()
 	arguments += "\"" + RyzomFilename + "\" \"" + ClientPatchPath + "\" " + ClientRootPath + "\"";
 #endif
 
-	// append login and password
-	arguments += " " + LoginLogin + " " + LoginPassword;
+	// append login, password and shard 
+	if (!LoginLogin.empty())
+	{
+		arguments += " " + LoginLogin;
+	
+		if (!LoginPassword.empty())
+		{
+			arguments += " " + LoginPassword;
 
 			if (!r2Mode)
 			{
 				arguments += " " + toString(LoginShardId);
 			}
+		}
+	}
 
 	if (!launchProgram(batchFilename, arguments, false))
 	{