Leading and trailing spaces in parameters lead to form error

[yanokwa]

Works

label=foo, value=bar
good-form.xlsx

Does not work due to leading/training spaces around =

label = foo, value = bar
bad-form.xlsx

Error: [row : 2] Parameter 'value' has a value which is not valid. Values must begin with a letter or underscore. Subsequent characters can include letters, numbers, dashes, underscores, and periods.

Feels like we should trim or ignore the spaces