Allow Blank Target & RIR Cells to Remain Blank in Athlete View

It would be great if any blank Target or RIR cells entered by the coach remained blank in the athlete view, rather than automatically displaying "Max" or a maximum weight value.

This would be particularly useful for warm-up sets, where coaches may intentionally leave the Target and RIR fields blank and only prescribe values for the work sets. Currently, the auto-population can create confusion for athletes by implying a target load or effort that was never intended.