Prevent NullPointerException by checking whether Knowledge Interaction ID is known by the receiver#482

Sophietje merged 2 commits intomasterTNO/knowledge-engine:masterfrom

480-nullpointerexception-can-occur-when-receiving-a-message-with-unknown-knowledge-interaction-idTNO/knowledge-engine:480-nullpointerexception-can-occur-when-receiving-a-message-with-unknown-knowledge-interaction-idCopy head branch name to clipboard