Fix NPE when reading or writing from a field that was empty before #33
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Fixing the regression introduced in #29.
In case a field is empty the whole
field
object returned from GH API upon reading isnull
and does not have avalue
key.It's safe to pass
undefined
ornull
tosetOutput
since under the hood SDK does the conversion of these to an empty string: https://github.com/actions/toolkit/blob/main/packages/core/src/core.ts#L199, https://github.com/actions/toolkit/blob/main/packages/core/src/utils.ts#L12-L13