QueryLoad not flagging empty query results, breaks emptySet

[hughess]

emptySet has stopped working, most likely due to changes in the QueryLoad function.

I've set up console logs in this section of QueryLoad and tested it with an empty query:

{#if !data}
    {console.log('!data')}

    <!-- data prop was not provided. Component to handle this prop-related error -->
    <slot loaded={data} />
{:else if !Query.isQuery(data)}
    {console.log('!Query.isQuery(data)')}

    <!-- data prop was provided, but it is not a query store -->
    {#if (Array.isArray(data) || !data) && isEmptyDataset(data) && $$slots.empty}
        <!-- handle case where data is not a query store but is also empty -->
        <slot name="empty" loaded={data} />
    {:else}
        <!-- Not a query store, nothing to be done -->
        <slot loaded={data} />
    {/if}
{:else if !_data || (!_data.dataLoaded && !_data.error)}
    {console.log('!_data || (!_data.dataLoaded && !_data.error)')}

    <slot name="skeleton" loaded={_data}>
        <div class="w-full h-64">
            <Skeleton />
        </div>
    </slot>
{:else if _data.error && $$slots.error}
    {console.log('_data.error && $$slots.error')}

    <slot name="error" loaded={_data} />
{:else if !_data.length && !_data.error && $$slots._empty}
    {console.log('!_data.length && !_data.error && $$slots._empty')}

    <slot name="empty" loaded={_data} />
{:else}
    {console.log('else')}

    <slot loaded={_data} />
{/if}

In my browser console I got:

!_data || (!_data.dataLoaded && !_data.error)

Then a split second later:

else