In Vala you can simply just check for str != "", this is enough.
No, if str is nullable it's semantically different, because str != ""
will be generated as
if (g_strcmp0 (_tmp1_, "") != 0) {
..
}
This will be TRUE for _tmp1_ being NULL because NULL isn't "" ( and
g_strcmp0 will return -1 because NULL is < everything)
so if str is nullable, str != "" means NULL or not empty.
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