Fix empty secret after running fillWithOtpParameters()

app/Models/TwoFAccount.php

@@ -374,6 +374,10 @@ class TwoFAccount extends Model implements Sortable
 
         $this->initGenerator();
 
+        // The generator could have been initialized without a secret, in that case it generates one on the fly.
+        // The secret attribute has thus to be updated
+        $this->secret = $this->secret ?: $this->generator->getSecret();
+        
         if ($this->otp_type === self::STEAM_TOTP || strtolower($this->service) === 'steam') {
             $this->enforceAsSteam();
         }