fix(core/SMART_EVENT_LINK) - Seperation and clarification of "not found or invalid, skipped"

[TheSCREWEDSoftware]

From:
SmartScript::ProcessAction: Entry 18945 SourceType 0, Event 3, Link Event 4 not found or invalid, skipped.

To:

and to: (alterated the ID to throw an error)

Changes Proposed:

This PR proposes changes to:

• Core (units, players, creatures, game systems).
• Scripts (bosses, spell scripts, creature scripts).
• Database (SAI, creatures, etc).

Issues Addressed:

• Closes N/A

SOURCE:

The changes have been validated through:

• Live research (checked on live servers, e.g Classic WotLK, Retail, etc.)
• Sniffs (remember to share them with the open source community!)
• Video evidence, knowledge databases or other public sources (e.g forums, Wowhead, etc.)
• The changes promoted by this pull request come partially or entirely from another project (cherry-pick). Cherry-picks must be committed using the proper --author tag in order to be accepted, thus crediting the original authors, unless otherwise unable to be found

Tests Performed:

This PR has been:

• Tested in-game by the author.
• Tested in-game by other community members/someone else other than the author/has been live on production servers.
• This pull request requires further testing and may have edge cases to be tested.

How to Test the Changes:

• This pull request can be tested by following the reproduction steps provided in the linked issue
• This pull request requires further testing. Provide steps to test your changes. If it requires any specific setup e.g multiple players please specify it as well.

.go c 18945
check your worldserver

To show the alterated error

-- Before change ID it's 4
UPDATE `smart_scripts` SET `id` = 15  WHERE `entryorguid` = 18945 AND `source_type` = 0 AND `id` = 4;

Known Issues and TODO List:

• [ ]
• [ ]

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For example: if a PR fixes spell X by changing a part of code that handles spells X, Y, and Z, we should not only test X, but we should test Y and Z as well.