gfx_measurestr() for empty string

If you pass in the empty string to gfx_measurestr(), then neither of the dimension variables change.

Code:

---

text_w = text_h = 100;
gfx_measurestr("", text_w, text_h);
// text_w == 100 && text_h == 100

---

I don't know what values they should have (0?) but remaining unchanged caused me a bit of trouble. :)

I'm on Windows 10 (REAPER v5.23/x64 rev 207a2c).

gfx_measurestr() for empty string