Anchor links with no href should be ignored by markup plugin

[dylankelly]

Describe the bug
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Anchor links that have no href attribute are being transformed into rpl-text-link when they should be treated as is.

See https://digital-engagement.atlassian.net/browse/SDPSUP-4363

To Reproduce
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Expected behaviour
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Actual behaviour
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Screenshots
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Versions

• Ripple:

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
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Add condition in https://github.com/dpc-sdp/ripple/blob/develop/packages/ripple-nuxt-tide/lib/config/markup-plugins.js#L186 to ignore tag transformation if it has no href attribute.