addRequiredUI_internal: Check if a question is required
Description
This function is for internal use. It will check if a question in the
user-supplied questions dataframe is required. If so, it will add the label
with an asterisk. If not, it will just return the label.
Usage
addRequiredUI_internal(df)
Arguments
df
One element (a dataframe) in the list of unique questions.
Value
A label with or without an asterisk to signify it is required.