Add missing case MSH_QUA_9 in MQuadrangle.h getTypeForMSH()

Geo/MQuadrangle.h

@@ -386,6 +386,7 @@ class MQuadrangleN : public MQuadrangle {
   virtual int getTypeForMSH() const
   {
     if(_order==2 && _vs.size() + 4 == 8) return MSH_QUA_8;
+    if(_order==2 && _vs.size() + 4 == 9) return MSH_QUA_9;
     if(_order==3 && _vs.size() + 4 == 12) return MSH_QUA_12;
     if(_order==3 && _vs.size() + 4 == 16) return MSH_QUA_16;
     if(_order==4 && _vs.size() + 4 == 16) return MSH_QUA_16I;