SDKtool: Only write values into kit that were set on the commandline
SDKtool: Only write values into kit that were set on the commandline

Do not put empty values for settings into the kits: These will prevent
data from being editable in Qt Creator.

Task-number: QTCREATORBUG-12017
Change-Id: I10f67ed0038ba7e1a79cbf7b5658247a2d18b8eb
Reviewed-by: Eike Ziller <c142da16c73a95a82d35191bcc55b22835617128@digia.com>

farseerri/git_code,Distrotech/qtcreator,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,danimo/qt-creator,AltarBeastiful/qt-creator,farseerri/git_code,Distrotech/qtcreator,omniacreator/qtcreator,farseerri/git_code,martyone/sailfish-qtcreator,danimo/qt-creator,Distrotech/qtcreator,farseerri/git_code,xianian/qt-creator,omniacreator/qtcreator,omniacreator/qtcreator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,Distrotech/qtcreator,Distrotech/qtcreator,kuba1/qtcreator,Distrotech/qtcreator,xianian/qt-creator,danimo/qt-creator,xianian/qt-creator,maui-packages/qt-creator,xianian/qt-creator,colede/qtcreator,maui-packages/qt-creator,xianian/qt-creator,maui-packages/qt-creator,maui-packages/qt-creator,martyone/sailfish-qtcreator,kuba1/qtcreator,xianian/qt-creator,amyvmiwei/qt-creator,danimo/qt-creator,farseerri/git_code,kuba1/qtcreator,AltarBeastiful/qt-creator,kuba1/qtcreator,omniacreator/qtcreator,danimo/qt-creator,farseerri/git_code,kuba1/qtcreator,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,maui-packages/qt-creator,amyvmiwei/qt-creator,AltarBeastiful/qt-creator,kuba1/qtcreator,xianian/qt-creator,omniacreator/qtcreator,maui-packages/qt-creator,danimo/qt-creator,martyone/sailfish-qtcreator,amyvmiwei/qt-creator,amyvmiwei/qt-creator,maui-packages/qt-creator,kuba1/qtcreator,xianian/qt-creator,kuba1/qtcreator,AltarBeastiful/qt-creator,colede/qtcreator,colede/qtcreator,omniacreator/qtcreator,danimo/qt-creator,danimo/qt-creator,martyone/sailfish-qtcreator,colede/qtcreator,xianian/qt-creator,colede/qtcreator,colede/qtcreator,AltarBeastiful/qt-creator,omniacreator/qtcreator,AltarBeastiful/qt-creator,martyone/sailfish-qtcreator,Distrotech/qtcreator,farseerri/git_code,kuba1/qtcreator,colede/qtcreator,farseerri/git_code,amyvmiwei/qt-creator,amyvmiwei/qt-creator,danimo/qt-creator