Better check

this check should be done also in NDEBUG mode

src/bias/MetaD.cpp

@@ -1055,7 +1055,7 @@ double MetaD::evaluateGaussian
  double tmpcv[1]; // tmp array with cv (to be used with doInt_)
  if(cv.size()>0) pcv=&cv[0];
  if(doInt_){
-   plumed_dbg_assert(cv.size()==1);
+   plumed_assert(cv.size()==1);
    pcv=&(tmpcv[0]);
    tmpcv[0]=cv[0];
    if(cv[0]<lowI_) tmpcv[0]=lowI_;