default values in dynamic.css (theme mode) not working

Hi Derek,

I have a custom css field, and have this style rule:

header {
   opacity: {{header_opacity|0.9}};
}

When header_opacity is unset (installed theme the first time) its not getting the default value, and throws a css error:

header {
   opacity: ;
}

Please a solution for this.

Thanks in advance. Best Regards.

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