fix: call to lower case only when message.type is defined (#2109)

Co-authored-by: Mihir Bhalala <77438541+mihir-4116@users.noreply.github.com>

src/warehouse/index.js

@@ -545,7 +545,7 @@ function processWarehouseMessage(message, options) {
       ? message.integrations[options.provider.toUpperCase()].options
       : {};
   const responses = [];
-  const eventType = message.type.toLowerCase();
+  const eventType = message.type?.toLowerCase();
   const skipTracksTable = options.integrationOptions.skipTracksTable || false;
   const skipReservedKeywordsEscaping =
     options.integrationOptions.skipReservedKeywordsEscaping || false;