[rubis] (bug-fix:minor) Use category.id-MIN_CATEGORY_ID when getting categories from configuration.
[rubis] (bug-fix:minor) Use category.id-MIN_CATEGORY_ID when getting categories from configuration.

yungsters/rain-workload-toolkit,sguazt/rain-workload-toolkit,yungsters/rain-workload-toolkit,sguazt/rain-workload-toolkit,sguazt/rain-workload-toolkit,yungsters/rain-workload-toolkit