Fix plugin crash when variable is passed for Options

[niveathika]

Purpose

$subject

Part of ballerina-platform/ballerina-library#2536

Examples

N/A

Checklist

• Linked to an issue
• Updated the changelog
• Added tests

[codecov]

Codecov Report

Merging #125 (22107b3) into main (8117580) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #125   +/-   ##
=========================================
  Coverage     86.01%   86.01%           
  Complexity      125      125           
=========================================
  Files            11       11           
  Lines           608      608           
  Branches        121      121           
=========================================
  Hits            523      523           
  Misses           52       52           
  Partials         33       33           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8117580...22107b3. Read the comment docs.