ucb: second try to fix weird STL assertion on tinderbox
ucb: second try to fix weird STL assertion on tinderbox

It's possible that the constructor of RegexpMapIterImpl does not
initialize m_aIndex, so try to park m_aIndex on some end() iterator;
it looks like m_aIndex will not actually be used in this case, because
m_nList = -1.

Change-Id: I74cd0d1d87f3e90217c39bcd3168f157066ff3cb

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core