Kdelibs4ConfigMigrator: skip reparsing if nothing was migrated.

Review Request #127931 - Created May 15, 2016 and submitted

Information
David Faure
kcoreaddons
master
Reviewers
kdeframeworks
mlaurent
This improves performance greatly for crazy PIM people calling
this code in an often-called constructor :-)

Found by callgrind'ing kmail. Not actually tested other than compilation and kcoreaddons unit tests, but seems clear enough.

Laurent Montel
David Faure
Review request changed

Status: Closed (submitted)

Change Summary:

Submitted with commit 80c6bd7198726bf8c8d7f9dba98347dd3459d682 by David Faure to branch master.
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