Fix node generation when a cdata property is null

[Kelgors]

Purpose / Goal

During XML building, CDATA with null value is not handled properly. When a value is null, the cdata property is ignored and treated as a normal node.

This PR aims to resolve this issue (#700) by handling the cdata property when it has a null value.

Benchmark

Before Changes

Running Suite: XML Builder benchmark
fxp : 73911.77177576702 requests/second
fxp - preserve order : 96821055.83555794 requests/second
xml2js  : 23993.824078178754 requests/second

After Changes

Running Suite: XML Builder benchmark
fxp : 71796.8171188612 requests/second
fxp - preserve order : 95102276.51741566 requests/second
xml2js  : 22884.60165181542 requests/second

Type

Please mention the type of PR

• Bug Fix
• Refactoring / Technology upgrade
• New Feature

Note : Please ensure that you've read contribution guidelines before raising this PR. If your PR is in progress, please prepend [WIP] in PR title. Your PR will be reviewed when [WIP] will be removed from the PR title.

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[coveralls]

coverage: 98.217% (+0.005%) from 98.212%
when pulling 60fe977 on Kelgors:fix/empty-cdata
into e132656 on NaturalIntelligence:master.