fillSpace: handle empty input

src/lib/utils/fillSpace.ts

@@ -4,6 +4,10 @@ function fillSpace(availableSpace: number, items: { min: number, max: number }[]
 }
 
 function findMeanSpaceFiller(availableSpace: number, items: { min: number, max: number }[]) {
+    if (items.length === 0) {
+        return 0;
+    }
+
     const ranges = buildRanges(items);
     let requiredSpace = items.reduce((acc, item) => acc + item.min, 0);
     for (const range of ranges) {

src/tests/units/utils/fillSpace.ts

@@ -4,6 +4,11 @@ tests.register("fillSpace", 1, () => {
         items: { min: number, max: number }[],
         expected: number[],
     }[] = [
+        {
+            availableSpace: 600,
+            items: [],
+            expected: [],
+        },
         {
             availableSpace: 600,
             items: [