Creating a custom column with invalid name errors panel

[mattrunyon]

Description

If you create a custom column on a table with an invalid name, an error is thrown and the panel errors out

Steps to reproduce

1. Create a table. E.g. in Python

from deephaven import new_table
from deephaven.column import string_col

table = new_table([
    string_col("Short", ["A" , "B", "C", "D"]),
])

2. Create a custom column from the table sidebar with an invalid name. E.g. "test name" which has a space and is not allowed

Expected results

3. Error message in the input

Actual results

3. Panel catches error and displays error state

Additional details and attachments

Should also check the column name does not exist in addition to being valid

Versions

• Deephaven: 0.22