command/module promise laments about return code 1

Hi,

So i have this simple module promise which calls a python script (module). 
i dont know why, but from one day to another it starts complaining about a 
not zero return code and
therefor goes to failed state.

the promise:

```
bundle agent cfe_internals_checkup { commands: 
"$(sys.workdir)/modules/cfe_db_check" args => "", module => "true", contain 
=> command_timeout(30), comment => "run the check meck fuck script", 
classes => cfe_db_module; reports: #CFE_DB_MODULE_KEPT:: # "Time: 
$(sys.date) - Bundle: $(this.bundle) - Message: cfe_db_check was running 
successfully."; CFAGENT_HANGS:: "Time: $(sys.date) - Bundle: $(this.bundle) 
- Message: Agent hangs, The Purge was initiated."; CFE_DB_ERRORS_FATAL:: 
"Time: $(sys.date) - Bundle: $(this.bundle) - Message: CFE internal 
Databases are bonkers, cfengine killed, cleanup triggered."; 
CFE_DB_IN_DIFFICULTIES:: "Time: $(sys.date) - Bundle: $(this.bundle) - 
Message: CFE internal Databases are in danger."; #CFE_DB_OK:: # "Time: 
$(sys.date) - Bundle: $(this.bundle) - Message: CFE internal Databases are 
good."; } body classes cfe_db_module { kept_returncodes => { "0" }; 
promise_kept => { "CFE_DB_MODULE_KEPT" }; } 
```
outcome:
```
root@aixstp17t1: /var/cfengine/outputs # /var/cfengine/bin/cf-agent -KI -b 
cfe_internals_checkup
    info: Using command line specified bundlesequence
    info: Executing 'timeout=30s' ... '/var/cfengine/modules/cfe_db_check '
    info: Command related to promiser '/var/cfengine/modules/cfe_db_check' 
returned code '1' not defined as promise kept, not kept or repaired; 
setting to failed
    info: Completed execution of '/var/cfengine/modules/cfe_db_check '
```

executing the python module directly in shell clearly returns zero...

```
root@aixstp17t1: /var/cfengine/outputs # 
/var/cfengine/modules/cfe_db_check;echo $?
+CFE_DB_OK
0
```
including 1 in kept_returncodes will silence this but i want to know the 
reason for this.

cfengine version is 3.18.2

an idea whats wrong here...

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