matlab: add missing error message

(cherry picked from commit adedd7d3)

Conflicts:

	matlab/print_info.m

matlab/print_info.m

@@ -68,7 +68,7 @@ if ~noprint
       case 43
         error('Covariance matrix of shocks is not positive definite')
       case 44 %DsgeLikelihood_hh / DsgeLikelihood
-        error('');
+        error('The covariance matrix of the measurement errors is not positive definite.');
       case 51
         error('You are estimating a DSGE-VAR model, but the value of the dsge prior weight is too low!')
       case 52 %DsgeVarLikelihood