Avoid bogus "class and block" error message when nil is passed (closes #70) #73
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See #70 - calling
transform nil
would give a very confusing message.This actually hints that it would be better to enforce this earlier, probably at the
Kiba.parse
time, to be able to provide more context to errors, including actual keyword used (source/transform/destination etc), and line numbers.(I will investigate further on that part, but no hurry at the moment though).