BaseQtVersion: Fix crash
BaseQtVersion: Fix crash

Fix crash when not passing and error-pointer to the methods running
Qmake.

Change-Id: Ic3d810ac55ea80338a662c8d853f3d998d818955
Reviewed-by: Friedemann Kleint <1b9f2592239daaec4856ccc1cfb4d2d55b35fb71@digia.com>

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