Remove the bug where downcase() is invoked on password which is optional and can be empty.

Author: jinq102030

modules/exploits/multi/http/tomcat_mgr_deploy.rb

@@ -312,7 +312,7 @@ def report_tomcat_credential
         origin_type: :service,
         module_fullname: self.fullname,
         private_type: :password,
-        private_data: datastore['PASSWORD'].downcase,
+        private_data: datastore['PASSWORD'],
         username: datastore['USERNAME']
     }