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truetypefs: fall back instead of crashing when could not get a glyph

--- a/sys/src/cmd/truetypefs.c

+++ b/sys/src/cmd/truetypefs.c

@@ -166,8 +166,10 @@

 			g = 0;

 		else

 			g = ttffindchar(t, s->start + i);

-		gs[i] = ttfgetglyph(t, g, 1);

-		w += gs[i]->width;

+		if((gs[i] = ttfgetglyph(t, g, 1)) == nil && g != 0)

+			gs[i] = ttfgetglyph(t, 0, 1);

+		assert(gs[i] != nil);

+	   w += gs[i]->width;

 	}

 	sz = 5 * 12 + (w+7>>3) * h + 3 * 12 + (n + 1) * 6;

 	d = emalloc(sz);