Remove stop commands from GPU regions.

Author: Diego Vaca

src/simulation/m_checker.fpp

@@ -330,7 +330,8 @@ contains
         @:PROHIBIT(bubbles_lagrange .and. file_per_process, "file_per_process must be false for bubbles_lagrange")
         @:PROHIBIT(bubbles_lagrange .and. n==0, "bubbles_lagrange accepts 2D and 3D simulations only")
         @:PROHIBIT(bubbles_lagrange .and. model_eqns==3, "The 6-equation flow model does not support bubbles_lagrange")
-        @:PROHIBIT(lag_params%cluster_type>=2 .and. lag_params%smooth_type/=1, "cluster_type=2 requires smooth_type=1")
+        @:PROHIBIT(bubbles_lagrange .and. lag_params%cluster_type<=0, "cluster_type must be specified")
+        @:PROHIBIT(bubbles_lagrange .and. lag_params%cluster_type>=2 .and. lag_params%smooth_type/=1, "cluster_type=2 requires smooth_type=1")
     end subroutine s_check_inputs_bubbles_lagrange
 
     !> Checks miscellaneous constraints,