QmlJS: Remove overzealous 'undefined' check for enums.
QmlJS: Remove overzealous 'undefined' check for enums.

The "value might be 'undefined'" warning triggered whenever the static
expression evaluator failed to produce a value. At the moment, it does
so for almost all non-trivial expressions.

The warning is now disabled.

Task-number: QTCREATORBUG-3208

omniacreator/qtcreator,hdweiss/qt-creator-visualizer,yinyunqiao/qtcreator,AltarBeastiful/qt-creator,omniacreator/qtcreator,duythanhphan/qt-creator,colede/qtcreator,richardmg/qtcreator,dmik/qt-creator-os2,martyone/sailfish-qtcreator,omniacreator/qtcreator,azat/qtcreator,darksylinc/qt-creator,darksylinc/qt-creator,KDAB/KDAB-Creator,AltarBeastiful/qt-creator,KDAB/KDAB-Creator,kuba1/qtcreator,farseerri/git_code,jonnor/qt-creator,danimo/qt-creator,martyone/sailfish-qtcreator,richardmg/qtcreator,Distrotech/qtcreator,KDAB/KDAB-Creator,malikcjm/qtcreator,malikcjm/qtcreator,colede/qtcreator,bakaiadam/collaborative_qt_creator,kuba1/qtcreator,martyone/sailfish-qtcreator,kuba1/qtcreator,richardmg/qtcreator,amyvmiwei/qt-creator,ostash/qt-creator-i18n-uk,duythanhphan/qt-creator,azat/qtcreator,KDE/android-qt-creator,xianian/qt-creator,sandsmark/qtcreator-minimap,syntheticpp/qt-creator,ostash/qt-creator-i18n-uk,malikcjm/qtcreator,syntheticpp/qt-creator,richardmg/qtcreator,AltarBeastiful/qt-creator,renatofilho/QtCreator,bakaiadam/collaborative_qt_creator,martyone/sailfish-qtcreator,AltarBeastiful/qt-creator,syntheticpp/qt-creator,danimo/qt-creator,farseerri/git_code,xianian/qt-creator,kuba1/qtcreator,xianian/qt-creator,farseerri/git_code,KDAB/KDAB-Creator,sandsmark/qtcreator-minimap,KDE/android-qt-creator,maui-packages/qt-creator,omniacreator/qtcreator,amyvmiwei/qt-creator,amyvmiwei/qt-creator,darksylinc/qt-creator,KDE/android-qt-creator,maui-packages/qt-creator,pcacjr/qt-creator,AltarBeastiful/qt-creator,hdweiss/qt-creator-visualizer,syntheticpp/qt-creator,KDE/android-qt-creator,malikcjm/qtcreator,jonnor/qt-creator,bakaiadam/collaborative_qt_creator,dmik/qt-creator-os2,renatofilho/QtCreator,pcacjr/qt-creator,KDE/android-qt-creator,amyvmiwei/qt-creator,azat/qtcreator,yinyunqiao/qtcreator,bakaiadam/collaborative_qt_creator,colede/qtcreator,Distrotech/qtcreator,pcacjr/qt-creator,amyvmiwei/qt-creator,hdweiss/qt-creator-visualizer,darksylinc/qt-creator,colede/qtcreator,martyone/sailfish-qtcreator,danimo/qt-creator,KDAB/KDAB-Creator,danimo/qt-creator,omniacreator/qtcreator,yinyunqiao/qtcreator,sandsmark/qtcreator-minimap,xianian/qt-creator,sandsmark/qtcreator-minimap,richardmg/qtcreator,malikcjm/qtcreator,hdweiss/qt-creator-visualizer,KDE/android-qt-creator,pcacjr/qt-creator,duythanhphan/qt-creator,danimo/qt-creator,jonnor/qt-creator,colede/qtcreator,farseerri/git_code,darksylinc/qt-creator,azat/qtcreator,danimo/qt-creator,farseerri/git_code,darksylinc/qt-creator,ostash/qt-creator-i18n-uk,pcacjr/qt-creator,omniacreator/qtcreator,bakaiadam/collaborative_qt_creator,maui-packages/qt-creator,dmik/qt-creator-os2,renatofilho/QtCreator,syntheticpp/qt-creator,dmik/qt-creator-os2,azat/qtcreator,yinyunqiao/qtcreator,ostash/qt-creator-i18n-uk,KDE/android-qt-creator,Distrotech/qtcreator,KDE/android-qt-creator,bakaiadam/collaborative_qt_creator,Distrotech/qtcreator,danimo/qt-creator,syntheticpp/qt-creator,amyvmiwei/qt-creator,duythanhphan/qt-creator,jonnor/qt-creator,hdweiss/qt-creator-visualizer,pcacjr/qt-creator,farseerri/git_code,kuba1/qtcreator,jonnor/qt-creator,AltarBeastiful/qt-creator,sandsmark/qtcreator-minimap,Distrotech/qtcreator,richardmg/qtcreator,renatofilho/QtCreator,malikcjm/qtcreator,ostash/qt-creator-i18n-uk,martyone/sailfish-qtcreator,renatofilho/QtCreator,hdweiss/qt-creator-visualizer,pcacjr/qt-creator,yinyunqiao/qtcreator,maui-packages/qt-creator,danimo/qt-creator,xianian/qt-creator,martyone/sailfish-qtcreator,maui-packages/qt-creator,xianian/qt-creator,jonnor/qt-creator,Distrotech/qtcreator,xianian/qt-creator,maui-packages/qt-creator,colede/qtcreator,ostash/qt-creator-i18n-uk,amyvmiwei/qt-creator,KDAB/KDAB-Creator,amyvmiwei/qt-creator,yinyunqiao/qtcreator,richardmg/qtcreator,xianian/qt-creator,AltarBeastiful/qt-creator,omniacreator/qtcreator,sandsmark/qtcreator-minimap,azat/qtcreator,darksylinc/qt-creator,bakaiadam/collaborative_qt_creator,duythanhphan/qt-creator,farseerri/git_code,kuba1/qtcreator,darksylinc/qt-creator,dmik/qt-creator-os2,danimo/qt-creator,ostash/qt-creator-i18n-uk,kuba1/qtcreator,duythanhphan/qt-creator,malikcjm/qtcreator,duythanhphan/qt-creator,renatofilho/QtCreator,dmik/qt-creator-os2,xianian/qt-creator,dmik/qt-creator-os2,yinyunqiao/qtcreator,Distrotech/qtcreator,kuba1/qtcreator,AltarBeastiful/qt-creator,syntheticpp/qt-creator,colede/qtcreator,maui-packages/qt-creator,farseerri/git_code,martyone/sailfish-qtcreator,martyone/sailfish-qtcreator,kuba1/qtcreator