@mixin value-item {
    .value-item {
        position: relative;
        padding: 3px 7px;
        background-color: #f3f3f3;
        text-shadow: 0 1px 1px rgba(255, 255, 255, 0.7);
        margin-bottom: 5px;

        > .actions {
            position: absolute;
            display: inline-block;
            right: 7px;
            margin-left: 10px;
        }

        &.disabled {
            color: #999;
            > .actions {
                display: none;
            }
        }
    }
}

.value-list {
    @include value-item;

    .toolbar {
        text-align: right;
    }

    .items-text {
        @include box-sizing(border-box);
        resize: vertical;
        display: none;
        width: 100%;
        min-height: 150px;
    }
}


.search-value-list {
    @include value-item;
}

@mixin value-item {
    .value-item {
        min-height: 20px;
        position: relative;
        padding: 3px 7px;
        background-color: #f3f3f3;
        text-shadow: 0 1px 1px rgba(255, 255, 255, 0.7);
        margin-bottom: 5px;

        > .actions {
            position: absolute;
            display: inline-block;
            right: 7px;
            margin-left: 10px;
        }

        &.disabled {
            color: #999;
            > .actions {
                display: none;
            }
        }
    }
}

.value-list {
    @include value-item;

    .toolbar {
        text-align: right;
    }

    .items-text {
        @include box-sizing(border-box);
        resize: vertical;
        display: none;
        width: 100%;
        min-height: 150px;
    }
}


.search-value-list {
    @include value-item;
}

Add min-height to value list items
Add min-height to value list items

This is specifically for items with a zero-length label.