Some changes to the mortar projector in case when it is created for an on-the-fly discontinuity. 


git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6760 04224531-1f84-46d8-96ce-875b9e37dce3
Cycle the entries in mortar constraints in the case when the indexes are zero. This is a sign that the dofs related to the projector do not exist for the variable. Currently these entries are not eliminated which may be problematic for some preconditioners. 


git-svn-id: svn://svn.code.sf.net/p/elmerfem/code/trunk@6761 04224531-1f84-46d8-96ce-875b9e37dce3