Fix repo update when null is returned (eg, no plugin has modified the repo).
Fix repo update when null is returned (eg, no plugin has modified the repo).

dregad/source-integration,bright-tools/source-integration,01-Scripts/source-integration,mantisbt-plugins/source-integration,morgant/source-integration,mantisbt-plugins/source-integration,bright-tools/source-integration,morgant/source-integration,bright-tools/source-integration,dregad/source-integration,morgant/source-integration,dregad/source-integration,bright-tools/source-integration-fixes,bright-tools/source-integration-fixes,bright-tools/source-integration-fixes,bright-tools/source-integration,make-all/source-integration,01-Scripts/source-integration,make-all/source-integration,make-all/source-integration,mantisbt-plugins/source-integration