Do not unnecessarily flag a rebuild of node access

Problem/Motivation

I'm installing the module as part of an installation profile of a distribution. Because it is now always flagging the node access rebuild in view_unpublished_install(), the very first thing the people see after installing my distribution is the false error message that they need to rebuild access permissions. This is not even true since there is no content available in the site at this point.

Proposed resolution

Check if there is actually unpublished content available in the database before flagging the error.

Remaining tasks

Implement the fix.

User interface changes

One less error message for the administrators to worry about.

API changes

None.

Data model changes

None.