Fix broken EnergyHistory plotting
Line 593 expects EnergyHistory objects to be wrapped in a list, but line 580 did not ensure they are wrapped. Fixed this.
Also, for consistency
- added list wrapping to line
618 - deleted de-wrapping in line
594
Line 593 expects EnergyHistory objects to be wrapped in a list, but line 580 did not ensure they are wrapped. Fixed this.
Also, for consistency
618
594