Fix NullPointerException when retrieving record with default value

[kaneeldias]

Purpose

$subject

Fixes: ballerina-platform/ballerina-library#2985

Examples

Checklist

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

[codecov]

Codecov Report

Merging #533 (4995eee) into master (d76321f) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #533      +/-   ##
==========================================
+ Coverage   80.25%   80.30%   +0.04%     
==========================================
  Files          38       38              
  Lines        3611     3615       +4     
  Branches      702      703       +1     
==========================================
+ Hits         2898     2903       +5     
+ Misses        490      489       -1     
  Partials      223      223              

Impacted Files	Coverage Δ
...c/main/java/io/ballerina/stdlib/sql/Constants.java	100.00% <ø> (ø)
...main/java/io/ballerina/stdlib/sql/utils/Utils.java	76.61% <ø> (ø)
...allerina/stdlib/sql/nativeimpl/QueryProcessor.java	82.35% <100.00%> (+0.14%)	⬆️
...allerina/stdlib/sql/utils/RecordIteratorUtils.java	72.72% <100.00%> (+2.72%)	⬆️
ballerina/types.bal	90.23% <0.00%> (+0.33%)	⬆️

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