Fixed crash with particle/dsge_base2.mod in the test suite.

tests/particle/dsge_base2.mod

@@ -81,7 +81,7 @@ options_.particle.algorithm = 'sequential_importance_particle_filter';
 //options_.particle.algorithm = 'each_gaussian_filter';
 //options_.particle.algorithm = 'gaussian_filter';
 
-options_.particle.IS_approximation_method = 'quadrature' ;
+//options_.particle.IS_approximation_method = 'quadrature' ;
 //options_.particle.IS_approximation_method = 'cubature' ;
 //options_.particle.IS_approximation_method = 'unscented' ;
 
@@ -90,4 +90,4 @@ options_.particle.IS_approximation_method = 'quadrature' ;
 //options_.particle.approximation_method = 'unscented' ;
 //options_.particle.approximation_method = 'MonteCarlo' ;
 
-estimation(datafile=data_risky_perturb2,nograph,order=2,nobs=100,mh_replic=0,mode_compute=7,mode_check);
\ No newline at end of file
+estimation(datafile=data_risky_perturb2,nograph,order=2,nobs=100,mh_replic=0,mode_compute=7,mode_check);