Added custom ArgumentErrors for bucket and folder nonexistence
Added custom ArgumentErrors for bucket and folder nonexistence

griddynamics/Behavior-Analytic-Starter-Kit,griddynamics/Behavior-Analytic-Starter-Kit,griddynamics/Behavior-Analytic-Starter-Kit,griddynamics/Behavior-Analytic-Starter-Kit,griddynamics/Behavior-Analytic-Starter-Kit,griddynamics/Behavior-Analytic-Starter-Kit,griddynamics/Behavior-Analytic-Starter-Kit