Fix debugger watch data tooltip.
Fix debugger watch data tooltip.

Display value correctly, omit empty display types.

Change-Id: I840a8bb1db65d721f871b9c33ca327f2ba6c8e26
Reviewed-by: hjk <f81b91af79013637d070c18d38a75b90eaae8ba3@nokiamail.com>

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