Problem with initialization of voltage variables

[keatsig]

The seems to be a problem with initializing voltage variables using add_voltage_starts!() .

In the variable_mc_bus_voltage() function for ACP/ACR formulations, there is

vm = haskey(busref, "vm_start") ? busref["vm_start"] : fill(0.0, ncnd) 
vm[.!grounded] .= 1.0

While the first line reads the start values defined by add_voltage_starts!(), it looks like the second line overwrites and reassigns vm to 1.0 (for test cases where most of the buses are ungrounded).

Maybe this could work (might not be ideal):

vm = haskey(busref, "vm_start") ? busref["vm_start"] : fill(1.0, ncnd)