fix: check modules before adding base meta modules

[meteyou]

This PR just add a condition before adding base meta modules. It just checks if the module exists, before adding it.

[guysoft]

Why are you doing this?
I am asking because

1. I want to know what flow is breaking for you, if any
2. These moduels are remote modules, their path is different and they are not in the DIST_PATH. They are retrieved like this:
   https://github.com/guysoft/CustomPiOS/wiki/Modules#remote-modules

[meteyou]

i just had issues to build images, because i got the error message, that the module was not found.

just my 2 cents: i don't like a system, which just adds modules and I don't know it... I would prefer to add modules myself, instead "auto hidden added modules".