[PE-D] Need for defensiveness in addR command

[nus-pe-bot]

Great work on the addR feature. It's quite complex, but it generally works.

A minor nit:

To reproduce:
use addR n/Chicken salad i/chicken - 100g, lettuce - a bit, tomato c/100 instr/Cook. Eat. . . . img/images/salad.jpg t/healthy t/delicious

Result:

Expected:
Just

1. Cook
2. Eat

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Labels: severity.Medium type.FunctionalityBug
original: lowjiefeng1998/ped#4