I am adding a new viz and added its data in `data/__init__.py`. I was loading
data from console as
```
from superset import cli
cli.load_examples(False)
```
It was working fine few days ago before new field was introduced
(https://github.com/apache/incubator-superset/commit/af4dd59661291541a8fa82717d07a3f214c8bd2f).
This field is not being migrated automatically. I have tried steps from
https://superset.incubator.apache.org/installation.html#upgrading but no luck.
### Superset version
0.25.6
### Expected results
Example data should be loaded
### Actual results
```
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such column:
tables.template_params [SQL: 'SELECT tables.created_on AS tables_created_on,
tables.changed_on AS tables_changed_on, tables.id AS tables_id,
tables.description AS tables_description, tables.default_endpoint AS
tables_default_endpoint, tables.is_featured AS tables_is_featured,
tables.filter_select_enabled AS tables_filter_select_enabled, tables."offset"
AS tables_offset, tables.cache_timeout AS tables_cache_timeout, tables.params
AS tables_params, tables.perm AS tables_perm, tables.table_name AS
tables_table_name, tables.main_dttm_col AS tables_main_dttm_col,
tables.database_id AS tables_database_id, tables.fetch_values_predicate AS
tables_fetch_values_predicate, tables.user_id AS tables_user_id, tables.schema
AS tables_schema, tables.sql AS tables_sql, tables.is_sqllab_view AS
tables_is_sqllab_view, tables.template_params AS tables_template_params,
tables.changed_by_fk AS tables_changed_by_fk, tables.created_
by_fk AS tables_created_by_fk \nFROM tables \nWHERE tables.table_name = ?\n
LIMIT ? OFFSET ?'] [parameters: ('loads', 1, 0)] (Background on this error at:
http://sqlalche.me/e/e3q8)
```
### Steps to reproduce
Run from command line
```
from superset import cli
cli.load_examples(False)
```
[ Full content available at:
https://github.com/apache/incubator-superset/issues/5199 ]
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