There are index length mismatch errors when n_days < 365

[paulapreuss]

Currently fixed with a try: except: block but we should find the underlying cause of the issue.

Also, there seem to be some index length mismatch issues when conducting a simulation < 365 days. I applied a quick fix in 0f14ef8, but this is something we should look at more in depth in the future.

Originally posted by @paulapreuss in #111 (comment)