Issue #3211681 by AaronBauman: Multipick List error getting value

...ping/src/Plugin/SalesforceMappingField/PropertiesBase.php

...g/src/Plugin/SalesforceMappingField/RelatedProperties.php

...orce_mapping_test_content.field_salesforce_test_multi.yml

...nstall/field.storage.node.field_salesforce_test_multi.yml

...fig/install/node.type.salesforce_mapping_test_content.yml

...ll/salesforce_mapping.salesforce_mapping.test_mapping.yml

.../salesforce_mapping_test/salesforce_mapping_test.info.yml

...alesforce_mapping/tests/src/Functional/PushParamsTest.php

src/Tests/objectDescribe.json