BUILDIN(getunits) BL_MOB returns 0 if no coordinates specified

[bWolfie]

Describe the bug
As title says. Unless you specify the coordinates, getunits(BL_MOB, ....) will return 0.

To Reproduce
Returns 0 even if mobs on the map.
.@count = getunits(BL_MOB, .@md, false, .@map$);

Returns expected count.
.@count = getunits(BL_MOB, .@md, false, .@map$, 0, 0, 100, 100);

Expected behavior

Screenshots

System specs (please complete the following information):

• OS: [CentOS7]
• Hercules Version [latest as of post]
• Mode: [pre-renewal]
• Packet version: [20160113]
• Client type: [main]

Plugins used or source modifications

Additional context