fix: renterd file health stats popover

Author: alexfreska

.changeset/heavy-geese-train.md

@@ -0,0 +1,5 @@
+---
+'renterd': patch
+---
+
+Fixed an issue where hovering over the file health information would crash the app. Closes https://github.com/SiaFoundation/renterd/issues/997

apps/renterd/components/Files/Columns/FilesHealthColumn/FilesHealthColumnContents.tsx

@@ -55,8 +55,9 @@ export function FilesHealthColumnContents({
   }
 
   const slabs = sortBy(
-    obj.data.object.slabs.map((s) => ({
+    obj.data.object.slabs?.map((s) => ({
       ...s.slab,
+      key: `${s.offset}${s.length}${s.slab.key}`,
       isPartialSlab: !!s.slab.shards,
       contractSetShards: s.slab.shards?.length
         ? computeSlabContractSetShards({
@@ -65,7 +66,7 @@ export function FilesHealthColumnContents({
             health: s.slab.health,
           })
         : 0,
-    })),
+    })) || [],
     'contractSetShards'
   )