UserFileAccessor: Assume that qtversions/toolchains files can be read
UserFileAccessor: Assume that qtversions/toolchains files can be read

We do not want to produce output here when those files can not be found,
that is a perfectly normal thing nowadays. So do not produce any output.

Simplify the code a bit now that we do not need to do extra checking.

Change-Id: Ifdfe3148e8a350bf3cd2aca5e78c2458274d75f9
Reviewed-by: Daniel Teske <d8a411aec9a206efedb4d45b75fe8d13f1e2b628@digia.com>

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