Hiding Icon in Hyperlink Column with No Link

[mstevens22]

I am using the following JSON to replace the Link in a Hyperlink Column with an Icon. However the icon shows even if there is no link entered in the column. How can I make it so the linkable Icon is only visible when there is actually a link?

{

"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",

"elmType": "a",

"attributes": {

"iconName": "Mail",

"class": "ms-fontColor-neutralDark",

"href": "=@currentField",

"target": "_blank"

},

"style": {

"font-size": "30px",

"text-decoration": "none",

"padding-left": "15px"

}

}

[#2 · Accepted solution]

Never mind I figured it out! I replaced the "iconName" with the following:
"iconName": "=if(@currentField =='','','Mail')",

[#3]

@mstevens22 Or simply use like: 

"iconName": "=if(@currentField,'Mail','')",

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[#4]

@mstevens22 Or you can use "display" property inside style to remove the complete anchor element: 

"display": "=if(@currentField, 'block', 'none')"

Or "visibility" property to hide complete anchor element from UI.

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