error with examples/html.janet

[rossajmcd]

Hi.

The delete function errors when clicking the 'delete' control in this example with error:

error: expected iterable type, got nil in merge [boot.janet] on line 1653, column 3 in prompt [../src/osprey/router.janet] on line 271, column 20 in [../src/osprey/router.janet] on line 262, column 5 in defer [/opt/homebrew/lib/janet/halo2.janet] on line 243, column 21 in try [/opt/homebrew/lib/janet/halo2.janet] on line 182, column 7 in [/opt/homebrew/lib/janet/halo2.janet] (tail call) on line 181, column 5