request: do not fully error on missing request

[catenacyber]

As it can happen in midstream case or gap
And the response may be handled as HTTP/0.9

Edit :
QA has same errors as OISF/suricata#12828 and next versions

[suricata-qa]

WARNING:

field	baseline	test	%
	SURI_TLPR1_stats_chk
.app_layer.error.http.parser	536	485	90.49%

Pipeline 25257

[catenacyber]

So, I think this is good and will require a QA rebaseline

[victorjulien]

Can you create SV tests for these cases?

[catenacyber]

Can you create SV tests for these cases?

Which cases ? The remaining errors ? (not direct as it comes from TLPR)

[victorjulien]

"As it can happen in midstream case or gap
And the response may be handled as HTTP/0.9"
This case ^

[catenacyber]

"As it can happen in midstream case or gap And the response may be handled as HTTP/0.9" This case ^

Spent too much time building OISF/suricata-verify#2372
Not sure I found the original case that led to this commit message...

[catenacyber]

New commit message in #450