Fix NullPointerException when retrieving record with default value for update 1

[kaneeldias]

Purpose

$subject

Related issue: #533

Examples

Checklist

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

[codecov]

Codecov Report

Merging #536 (953b6fd) into release-1.4.1 (e27e885) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@                Coverage Diff                @@
##           release-1.4.1     #536      +/-   ##
=================================================
+ 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/client.bal	91.66% <0.00%> (+8.33%)	⬆️

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