Merge branch 'allow-empty-session-target' into 'master'

Allowed empty session target

See merge request cryton/cryton-modules!44

modules/mod_msf/mod.py

@@ -222,7 +222,7 @@ def execute(args: dict) -> dict:
     if session_target is None:
         session_target = get_session_target(module_options)
 
-    if session_target:
+    if session_target is not None:
         # Get sessions before
         before_sessions = msf.get_sessions(target_host=session_target, via_exploit=module, via_payload=payload)
 
@@ -278,7 +278,7 @@ def execute(args: dict) -> dict:
         ret_vals[RETURN_CODE] = 0
 
     # Check for Error or Success
-    if session_target:
+    if session_target is not None:
         new_session_id = get_created_session(msf, session_target, module, payload, before_sessions)
         if new_session_id is not None:
             ret_vals[RETURN_CODE] = 0