nil checks when assigning to param map in resourceAwsSsmDocumentRead (#12891)

* add nil check when assingment from a doc parameter to the param map

* remove println

builtin/providers/aws/resource_aws_ssm_document.go

@@ -205,9 +205,15 @@ func resourceAwsSsmDocumentRead(d *schema.ResourceData, meta interface{}) error
 		if dp.DefaultValue != nil {
 			param["default_value"] = *dp.DefaultValue
 		}
+		if dp.Description != nil {
 			param["description"] = *dp.Description
+		}
+		if dp.Name != nil {
 			param["name"] = *dp.Name
+		}
+		if dp.Type != nil {
 			param["type"] = *dp.Type
+		}
 		params = append(params, param)
 	}