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Check for empty values
As a general rule, if a value of a custom field is empty, its corresponding metafield either does not exist or is an empty string.
A test for that particular custom field will not return anything ("blank" in Liquid terms), which gives you a nice clean syntax for checking if a given field has a value:
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{% if product.metafields.accentuate.title %}
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<h1>{{ product.metafields.accentuate.title }}</h1>
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{% endif %}
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If you need to show a default value in case nothing is assigned to a metafield, you can use the 'default' Liquid filter:
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<h1>{{ product.metafields.accentuate.title | default: 'Default title' }}</h1>
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Multi-language fields
For multi-language fields, where there can be a value for one language and no value for another, you will need to test if the content for a specific language is a blank string or not:
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{% if product.metafields.accentuate.message['en'] != blank %}
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<p>{{ product.metafields.accentuate.message['en'] }}</p>
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{% endif %}
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Repeatable fields
If you are testing to see if an element in a repeatable field has a value, you need to test if the element's value is either an empty string or null, both of which can be tested via the length of the element's value:
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{% for ingredient in product.metafields.accentuate.ingredients %}
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{% if ingredient.size > 0 %}
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<p>{{ ingredient }}</p>
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{% endif %}
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{% endfor %}
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And, if you are testing to see if a repeatable field has any elements at all:
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{% if product.metafields.accentuate.ingredients.size == 0 %}
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<p>No ingredients have been added</p>
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{% endif %}
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