add check for name in Avatar component

packages/bbui/src/Avatar/Avatar.svelte

@@ -16,8 +16,11 @@
 
   function getInitials(name) {
     let parts = name.split(" ")
+    if (parts.length > 0) {
       return parts.map(name => name[0]).join("")
     }
+    return name
+  }
 </script>
 
 {#if url}