fix build options that should have empty list as default value #4108
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For build options like
from_pr
we assume throughout the code that they have an empty list as default value, see for example:easybuild-framework/easybuild/framework/easyconfig/tools.py
Line 343 in 95bae20
There are situations where that's currently not the case though, primarily when EasyBuild is being used as a library (cfr. this tutorial section).
That's fixed by the changes being made here, by implementing special treatment for build options that should have a unique empty list as default value.