Add "this->" in order to follow the coding convention.

git-svn-id: https://svn.sourceforge.jp/svnroot/molds/trunk@1410 1136aad2-a195-0410-b898-f5ea1d11b9d8
Fix forgotten initialization. #31716

git-svn-id: https://svn.sourceforge.jp/svnroot/molds/trunk@1411 1136aad2-a195-0410-b898-f5ea1d11b9d8
Test for ser/des of MolDSException