Reduce amount of code necessary for bug fix

Author: crokita

lib/js/src/manager/SystemCapabilityManager.js

@@ -755,9 +755,7 @@ class SystemCapabilityManager extends _SubManagerBase {
         if (displayCapabilitiesOld !== null && displayCapabilitiesOld !== undefined) { // The capability exists
             // Copied from the RAI response, since this parameter is not present in WindowCapability
             convertedCapabilities.setScreenParams(displayCapabilitiesOld.getScreenParams());
-            if (displayCapabilitiesOld.getMediaClockFormats() === null) {
-                convertedCapabilities.setMediaClockFormats([]); // insert empty array since this parameter is mandatory
-            } else {
+            if (displayCapabilitiesOld.getMediaClockFormats() !== null) {
                 convertedCapabilities.setMediaClockFormats(displayCapabilitiesOld.getMediaClockFormats());
             }
         }