Make sure m_rulesMessages is filled after successfull match #2048
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This fixes issue #2000.
The problem seems to be that the conditions to push ruleMessage below is not met when only deny action is used:
https://github.com/SpiderLabs/ModSecurity/blob/6d5198b1a60992416c9c8f1d77754e8e5edba996/src/rule.cc#L815-L822
Then when the for loop to append m_rulesMessages to the audit_log string stream is called, the content of this std::list seems to be empty:
https://github.com/SpiderLabs/ModSecurity/blob/6d5198b1a60992416c9c8f1d77754e8e5edba996/src/transaction.cc#L1486-L1489