Search fails for extensions without active version

[netomi]

When doing a search it might happen that extensions are included that have no active version.

This can happen if all published versions of an extension are deactivated. If that happens, the search ends in an exception as the code usually assumes that there is a latest version available.

We need to make sure that either:

• only extensions are returned by the search for which there are active versions
• properly filter out such extensions w/o active versions

[netomi]

the problem seems to have been caused by a case where an extension was marked as being active while it did not have any active extension version. the only version that was present was inactive.

Fixing that in the db resolved the NullPointerException, however we need to:

• understand how this happened to prevent it from happening again
• be more resilient if such a case happens and not throw exceptions