fix: 🐛 Load default display set when no time metadata (#1684)

* fix: 🐛 Load default display set when no time metadata

Load default displayset (first item in the array) when no series date or
series time availalbe

✅ Closes: #1683

* Add batch update

* Fix tests.

Co-authored-by: James Petts <jamesapetts@gmail.com>

platform/core/src/utils/loadAndCacheDerivedDisplaySets.js

@@ -90,7 +90,7 @@ const loadAndCacheDerivedDisplaySets = (referencedDisplaySet, studies) => {
 
     // find most recent and load it.
     let recentDateTime = 0;
-    let recentDisplaySet;
+    let recentDisplaySet = displaySets[0];
 
     displaySets.forEach(displaySet => {
       const dateTime = Number(