Show a message box if opening a project fails via File/Open
Show a message box if opening a project fails via File/Open

Task-number: QTCREATORBUG-7447

Change-Id: I421d93ccd9e12de854bd5a0ab35158b450863fec
Reviewed-by: Daniel Teske <d8a411aec9a206efedb4d45b75fe8d13f1e2b628@nokia.com>

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