CppEditor: Fix potential crash
CppEditor: Fix potential crash

The m_snapshotUpdater may never be accessed directly.

Change-Id: Id773a291f66e93a48ae46f2b1c04417af2f26763
Reviewed-by: Nikolai Kosjar <9571db158ca61a0d070db010803474231fa0cbab@digia.com>

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