From b728cbd90aa3b8d6619588fd5d78f140a39b27ec Mon Sep 17 00:00:00 2001
From: Pieter Vander Vennet <pietervdvn@posteo.net>
Date: Fri, 3 Feb 2023 03:55:33 +0100
Subject: [PATCH] Improve utils: add documentation and test of NoEmpty, return
 empty list if undefined

---
 Utils.ts | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Utils.ts b/Utils.ts
index 6ed49a2fa..1b97d00a2 100644
--- a/Utils.ts
+++ b/Utils.ts
@@ -268,8 +268,19 @@ In the case that MapComplete is pointed to the testing grounds, the edit will be
         return hist
     }
 
+    /**
+     * Removes all empty strings from this list
+     * If undefined or null is given, an empty list is returned
+     *
+     * Utils.NoEmpty(undefined) // => []
+     * Utils.NoEmpty(["abc","","def", null]) // => ["abc","def", null]
+     *
+     */
     public static NoEmpty(array: string[]): string[] {
         const ls: string[] = []
+        if(!array){
+            return ls
+        }
         for (const t of array) {
             if (t === "") {
                 continue