Unit exists/party member check

[0x0017c90c] slti r2,r4,0x0015
[0x0017c910] beq r2,r0,0x0017c948
[0x0017c914] sll r2,r4,0x03
[0x0017c918] subu r2,r2,r4
[0x0017c91c] sll r4,r2,0x06
[0x0017c920] lui r1,0x8019
[0x0017c924] addu r1,r1,r4
[0x0017c928] lbu r3,0x08cd(r1)
[0x0017c92c] ori r2,r0,0x00ff
[0x0017c930] beq r3,r2,0x0017c948
[0x0017c934] nop
[0x0017c938] lui r2,0x8019
[0x0017c93c] addiu r2,r2,0x0a3a
[0x0017c940] j 0x0017c94c
[0x0017c944] addu r2,r4,r2
[0x0017c948] addu r2,r0,r0
[0x0017c94c] jr r31
[0x0017c950] nop