debugger: fix soft assertion when "operate by instruction" was toggle without a valid stack trace.
debugger: fix soft assertion when "operate by instruction" was toggle without
a valid stack trace.

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