lnsrch1.m: do not display debugging info for perfect_foresight_solver

Necessary info does not exist within function to correctly identify problematic variables, leading to crashes with stack_solve_algo=7

matlab/lnsrch1.m

@@ -49,6 +49,7 @@ nn = length(j2);
 summ = sqrt(p'*p);
 
 if ~isfinite(summ) 
+    if ~isequal(func,@perfect_foresight_problem)
         eq_number_string=[];
         for ii=1:length(j1)-1
             eq_number_string=[eq_number_string, num2str(j1(ii)), ', '];
@@ -67,6 +68,7 @@ if ~isfinite(summ)
             fprintf('%-s % 8.4g \n',Model.endo_names(ii,:),xold(ii));
         end
         skipline();    
+    end
     error(['Some element of Newton direction isn''t finite. Jacobian maybe' ...
            ' singular or there is a problem with initial values'])
 end