fix: don't throw error on empty endpoint options

Author: adamberecz

src/composables/useOptions.js

@@ -634,9 +634,14 @@ export default function useOptions (props, context, dep)
     }
 
     // Transforming an plain arrays to an array of objects
-    uo = uo.map((val) => {
-      return typeof val === 'object' ? val : { [valueProp.value]: val, [trackBy.value[0]]: val, [label.value]: val}
-    })
+    /* istanbul ignore else */
+    if (uo && Array.isArray(uo)) {
+      uo = uo.map((val) => {
+        return typeof val === 'object' ? val : { [valueProp.value]: val, [trackBy.value[0]]: val, [label.value]: val}
+      })
+    } else {
+      uo = []
+    }
 
     return uo
   }