Check for only spaces

[ThomasTJdev]

To ensure that we dont populate a IN (xxx) with empty data strip() and check:

nim_sqlbuilder/src/sqlbuilderpkg/select.nim

Lines 25 to 34 in 499dc88

	if access != "":
	if wes.len == 0:
	acc.add(" WHERE " & accessC & " in ")
	acc.add("(")
	else:
	acc.add(" AND " & accessC & " in (")
	for a in split(access, ","):
	acc.add(a & ",")
	acc = acc[0 .. ^2]
	acc.add(")")