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gdImageStringFT() fails for empty strings as of libgd 2.3.0 #615

Description

@cmb69

When trying to render an empty string via gdImageStringFT(), the function fails as of libgd 2.3.0, while formerly it was just a no-op.

Test script

#include <stdio.h>
#include <gd.h>

int main()
{
    gdImagePtr im;
    int fg;
    int rect[8];
    char *res;

    im = gdImageCreate(100, 100);
    fg = gdImageColorAllocate(im, 255, 255, 255);
    res = gdImageStringFT(im, rect, fg, "/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf", 12, 0, 10, 10, "");
    if (res) printf("%s\n", res);
    return 0;
}

Expected output

okay

Actual output

Problem doing text layout

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