cubicweb-brainomics #2583883 missing test for NoHookRQLObjectStore [done]

Script importers/localizer.py should test sqlgen_store and avoid calling flush() for NoHookRQLObjectStore.

prioritynormal
typebug
done in<not specified>
load left0.000
closed by#208aa483385c [importers] NoHookRQLObjectStore lacks flush(), (closes #2583883)