Bug: Fix same-day error for portfolio historical trades.

[jfarid27]

Description

During portfolio loading, adds last traded date in historical prices if last date isn't available. This is a very odd time dependent off by 1 error, so testing this might be difficult.

Issue

#2450

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[JerBouma]

Looks good.

[montezdesousa]

When date we are searching is larger than the max index value .searchsorted() outputs the position next to last, giving out of bounds error. Well spotted

ser = pd.Series([1, 3, 5])
ser.searchsorted(8)

Outputs index number 3, out of bounds.