Fix bad reference when image picker is canceled (#1598)

src/view/com/util/UserAvatar.tsx

@@ -174,6 +174,9 @@ export function UserAvatar({
               aspect: [1, 1],
             })
             const item = items[0]
+            if (!item) {
+              return
+            }
 
             const croppedImage = await openCropper(store, {
               mediaType: 'photo',

src/view/com/util/UserBanner.tsx

@@ -69,6 +69,9 @@ export function UserBanner({
               return
             }
             const items = await openPicker()
+            if (!items[0]) {
+              return
+            }
 
             onSelectNewBanner?.(
               await openCropper(store, {