Empty space in table nor rendered properly for tags and also causing weird filter behavior

[mturoci]

via @g-eoj

Wave SDK Version, OS

0.25.2

Actual behavior

Expected behavior

If tag value is an empty string, nothing should be rendered. The empty option should also not be present in filters if the table column is filterable.

Steps To Reproduce

# Table / Tags
# Use tags in order to emphasize a specific value. For multiple tags in a single row use `,` as a delimiter.
# ---
from faker import Faker
from h2o_wave import main, app, Q, ui

fake = Faker()

_id = 0


class Issue:
    def __init__(self, text: str, tag: str):
        global _id
        _id += 1
        self.id = f'I{_id}'
        self.text = text
        self.tag = tag


# Create some issues
issues = [Issue(text=fake.sentence(), tag=('' if i % 2 == 0 else 'DONE,SUCCESS')) for i in range(10)]

columns = [
    ui.table_column(name='text', label='Issue', min_width='400px'),
    ui.table_column(name='tag', label='Badge', filterable=True, cell_type=ui.tag_table_cell_type(name='tags', tags=[
        ui.tag(label='FAIL', color='$red'),
        ui.tag(label='DONE', color='#D2E3F8', label_color='#053975'),
        ui.tag(label='SUCCESS', color='$mint'),
    ])),
]


@app('/demo')
async def serve(q: Q):
    q.page['example'] = ui.form_card(box='1 1 -1 -1', items=[
        ui.table(
            name='issues',
            columns=columns,
            rows=[ui.table_row(name=issue.id, cells=[issue.text, issue.tag]) for issue in issues],
        )
    ])
    await q.page.save()