Add length check (seting it) for sequences #1116
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The test of the 0th element of a sequence being None is replaced by a test function that also sets the length of
_FakeSequence
objects, making them iterable afterwards. This is replacing the old hidden magic of setting the size on read access (from solph v0.5.3) by explicit write access at the same points in the code. (Just once in the beginning instead of multiple times on each access.)Fixes #1115