Implemented: EZP-23260 eZ Find update index script shouldn't run if eZ F...

...ind is not enabled

Implements: https://jira.ez.no/browse/EZP-23260

When eZ Find is not enable you can still run the inde process, but as ezfind inis won't be taken in account, index process will fail. 

This patch finish the process before trying to index anything if eZ Find is not enabled.