Fix nodal weak mode of "Level Projector".


git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@7052 04224531-1f84-46d8-96ce-875b9e37dce3
still about 'level projector' weak nodes.


git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@7053 04224531-1f84-46d8-96ce-875b9e37dce3