Build break in current master

[Regina Henschel <rb.henschel@xxxxxxxxxxx>]

Hi all,

in a clean debug build with last commit 
b39b15c639960a37ed53d82cef44e64ef58c141e,

I get a build failure
C:/BuildLO/core/svx/source/table/tablehtmlimporter.cxx(500): error 
C2220: the following warning is treated as an error
C:\BuildLO\core\svx\source\table\tablehtmlimporter.cxx(446) : warning 
C6011: Dereferencing NULL pointer 'mpActDefault'. : Lines: 428, 429, 
430, 440, 441, 443, 444, 445, 446

Kind regards,
Regina