Catalog Indexer Bugfix

Bugfix for catalog indexer. Necessary for Magento 2.0.* & 2.1.*.

Github issue, StackOoerflow.

Enable module:

php -f bin/magento module:enable SpringImport_CatalogIndexerBugfix

Disable module:

php -f bin/magento module:disable SpringImport_CatalogIndexerBugfix

Update system:

php -f bin/magento setup:upgrade