[bugfix] Package manager: uninstalling a package with empty target collection caused entire db to be deleted. Refuse to deploy if target is empty.
Merge pull request #188 from wolfgangmm/develop

[bugfix] Package manager: uninstalling a package with empty target colle...
[bugfix] Collections below /db/system/config should never be removed from collection cache. Randomly removing collection configurations from the cache led to index failures once the cache was being filled up.
Merge pull request #189 from wolfgangmm/develop

Severe: index failures due to collection cache