Fix error on code completion for SQL file with unrecognized DAO method

[xterao]

Overview

This PR fixes an issue where invoking code completion on an SQL file that does not recognize the corresponding DAO method results in an error. The error occurs when the system attempts to retrieve the first element from an empty list during the suggestion of the top binding variable.

Bug Description

• When code completion is executed on an SQL file without a recognized DAO method, an error occurs due to attempting to get the first element from an empty suggestion list.
• This issue may also occur if the DAO class file is not located within the source directory or when working with temporary SQL files.

Changes

• Removed the precondition check for the DAO method.
• Added a condition to skip processing when the list of code completion targets is empty.
• Adjusted the logic in SqlParameterCompletionProvider to prevent error scenarios during code completion.

Expected Behavior

• Code completion will not continue if no available target elements are found.
• The error is prevented by checking for empty suggestions before accessing the first element.

[Copilot]

Pull Request Overview

This PR fixes a code completion error in SQL files that occurs when no corresponding DAO method is recognized. The fix prevents an IndexOutOfBoundsException by adding null-safety checks and removing a precondition that was too restrictive.

• Removed debug print statement from test file
• Added null-safety checks in SqlParameterCompletionProvider to handle cases where DAO method is not found
• Modified early return condition to handle empty element lists regardless of DAO method presence

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
SqlSpecificParamTypeCompleteTest.kt	Removed debug print statement
SqlParameterCompletionProvider.kt	Added null-safety checks and modified early return logic to prevent errors when DAO method is not found

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