Fix: use placeholder in comments for empty component names #949

Job	Run time
get-leptos-changed / Detect Source Change	7s
CI (integrations/viz) / Run ci (nightly)	19m 55s
CI (integrations/utils) / Run ci (nightly)	18m 37s
CI (integrations/axum) / Run ci (nightly)	19m 36s
CI (integrations/actix) / Run ci (nightly)	17m 28s
CI (leptos) / Run ci (nightly)	1h 35m 7s
CI (leptos_config) / Run ci (nightly)	17m 48s
CI (leptos_dom) / Run ci (nightly)	38m 28s
CI (leptos_hot_reload) / Run ci (nightly)	14m 31s
CI (leptos_macro) / Run ci (nightly)	27m 39s
CI (leptos_reactive) / Run ci (nightly)	54m 13s
CI (leptos_server) / Run ci (nightly)	26m 18s
CI (meta) / Run ci (nightly)	16m 28s
CI (router) / Run ci (nightly)	17m 42s
CI (server_fn) / Run ci (nightly)	22m 46s
CI (server_fn_macro) / Run ci (nightly)	16m 18s
CI (server_fn/server_fn_macro_default) / Run ci (nightly)	17m 17s
	7h 20m 18s

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