bugfix - analytics prototype - fix customData promise (#225)

Author: MO-Thibault

lib/addons/prototypes/analytics.js

@@ -277,7 +277,6 @@ class OptablePrebidAnalytics {
         missed,
         url: `${window.location.hostname}${window.location.pathname}`,
         tenant: this.config.tenant,
-        sessionDepth: sessionStorage.optableSessionDepth,
         // eslint-disable-next-line no-undef
         optableWrapperVersion: SDK_WRAPPER_VERSION,
       };
@@ -287,11 +286,10 @@ class OptablePrebidAnalytics {
       );
 
       if (window.optable.customAnalytics) {
-        const customData = window.optable.customAnalytics();
-        if (Object.entries(customData).length) {
-          this.log(`Adding custom data to payload ${JSON.stringify(customData)}`);
-          witnessData = { ...witnessData, ...customData };
-        }
+        await window.optable.customAnalytics().then((response) => {
+          this.log(`Adding custom data to payload ${JSON.stringify(response)}`);
+          Object.assign(witnessData, response);
+        });
       }
       await this.sendToWitnessAPI("auction_processed", {
         auction: JSON.stringify(witnessData),