handle no signature on callback #434

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 26.x)	59s
mix test (Elixir 1.12.x \| Erlang/OTP 22.x)	38s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	1m 39s
mix test (Elixir 1.12.x \| Erlang/OTP 23.x)	45s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	1s
mix test (Elixir 1.12.x \| Erlang/OTP 24.x)	39s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	1m 33s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	40s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	1m 35s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	48s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 28s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	40s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 44s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	39s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	1m 38s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 25s
mix test windows (Elixir 1.14.x \| Erlang/OTP 26.x)	1m 23s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	40s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	1m 26s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	43s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	1m 34s
mix test (Elixir 1.14.x \| Erlang/OTP 26.x)	41s
mix test windows (Elixir 1.15.x \| Erlang/OTP 26.x)	1m 33s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	38s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	40s
mix test (Elixir 1.15.x \| Erlang/OTP 26.x)	1s
	26m 10s

Provide feedback