bugfix/KAD-3949

[gilbert-hernandez]

🎫 #[Jira Ticket]
https://stellarwp.atlassian.net/browse/KAD-3949
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Checklist

• I have performed a self-review.
• No unrelated files are modified.
• No debugging statements exist (Ex: console.log, error_log).
• There are no warnings or notices in the wordpress error log.
• Passes all tests (linting, acceptance, & unit)

Block specific checklist (where relevant)

• Tested with an existing instance of this block .
• Tested creating a new instance of this block.
• Tested with Dynamic content & Elements.

[gilbert-hernandez]

I opted to add the $attributes['textShadow'] array if it was empty instead of messing with the other conditionals. This fix ensures that the textShadow attribute exists and has values if the default values aren't changed and the option for the text shadow is enabled.