Handle nil error when creating adapted payloads

[dwelch-r7]

Issue introduced as part of #17901

When doing show payloads for a module that supports the encrypted payloads on a machine that doesn't have mingw available we try to adapt a nil payload, this PR is just adding a check to make sure the payload we want to adapt is actually available

msf6 exploit(multi/handler) > show payloads
[-] Error while running command show: undefined method `new' for nil:NilClass

Call stack:
/Users/dwelch/dev/metasploit-framework/lib/msf/core/payload_set.rb:156:in `calculate_adapted_single_payload'
/Users/dwelch/dev/metasploit-framework/lib/msf/core/payload_set.rb:390:in `add_cached_module'
/Users/dwelch/dev/metasploit-framework/lib/msf/core/payload_set.rb:318:in `add_module'
/Users/dwelch/dev/metasploit-framework/lib/msf/core/module_manager/loading.rb:108:in `on_module_load'
/Users/dwelch/dev/metasploit-framework/lib/msf/core/modules/loader/base.rb:202:in `load_module'
/Users/dwelch/dev/metasploit-framework/lib/msf/core/module_manager/cache.rb:101:in `block in load_cached_module'
/Users/dwelch/dev/metasploit-framework/lib/msf/core/module_manager/cache.rb:98:in `each'
/Users/dwelch/dev/metasploit-framework/lib/msf/core/module_manager/cache.rb:98:in `load_cached_module'
/Users/dwelch/dev/metasploit-framework/lib/msf/core/module_set.rb:42:in `create'
/Users/dwelch/dev/metasploit-framework/lib/msf/core/module_set.rb:26:in `[]'
/Users/dwelch/dev/metasploit-framework/lib/msf/core/exploit.rb:705:in `is_payload_compatible?'
/Users/dwelch/dev/metasploit-framework/lib/msf/core/exploit.rb:744:in `block in compatible_payloads'
/Users/dwelch/dev/metasploit-framework/lib/msf/core/exploit.rb:743:in `each'
/Users/dwelch/dev/metasploit-framework/lib/msf/core/exploit.rb:743:in `compatible_payloads'
/Users/dwelch/dev/metasploit-framework/lib/msf/ui/console/command_dispatcher/modules.rb:1398:in `show_payloads'
/Users/dwelch/dev/metasploit-framework/lib/msf/ui/console/command_dispatcher/modules.rb:590:in `block in cmd_show'
/Users/dwelch/dev/metasploit-framework/lib/msf/ui/console/command_dispatcher/modules.rb:571:in `each'
/Users/dwelch/dev/metasploit-framework/lib/msf/ui/console/command_dispatcher/modules.rb:571:in `cmd_show'
/Users/dwelch/dev/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:581:in `run_command'
/Users/dwelch/dev/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:530:in `block in run_single'
/Users/dwelch/dev/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:524:in `each'
/Users/dwelch/dev/metasploit-framework/lib/rex/ui/text/dispatcher_shell.rb:524:in `run_single'
/Users/dwelch/dev/metasploit-framework/lib/rex/ui/text/shell.rb:168:in `run'
/Users/dwelch/dev/metasploit-framework/lib/metasploit/framework/command/console.rb:48:in `start'
/Users/dwelch/dev/metasploit-framework/lib/metasploit/framework/command/base.rb:82:in `start'
./msfconsole:23:in `<main>'

Verification steps

• Boot up msfconsole
• use exploit/multi/handler
• show payloads

[adfoster-r7]

Release Notes

Fixes a crash when running the show payloads command for a module that supports encrypted payloads on a machine that doesn't have a Mingw compiler available