Remove the bug where downcase() is invoked on password which is optio… #7529
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The simple fix the bug where the module exploits/multi/http/tomcat_mgr_deploy will call downcast() on the password user parameter, but this parameter is optional and can be empty, causing an error.
Verification
List the steps needed to make sure this thing works
Assume you have tomcat mgr installed on localhost:
msfconsole
use exploits/multi/http/tomcat_mgr_deploy
set RHOST 127.0.0.1