psexec_command - Unable to execute specified command: can't convert nil into Integer
Patched as described in Redmine bug #7680
Allow OptInt to pass "" for special reasons

Cheap fix
Merge branch 'bug/rm7680-psexec_command-convert-nil-into-integer' of github.com:lmercer-r7/metasploit-framework into lmercer-r7-bug/rm7680-psexec_command-convert-nil-into-integer
Merge branch 'master' of github.com:rapid7/metasploit-framework into rapid7
Deal with alread-normalized ints

[See #1308][See #1304]
Don't bother nil check, to_s handles it
Merge branch 'master' of git://github.com/rapid7/metasploit-framework