From b10826607ded0ae69b06f18004ac1eb6f3a1c757 Mon Sep 17 00:00:00 2001
From: Jeremy Jay <jeremy@pbnjay.com>
Date: Tue, 11 Feb 2020 10:00:54 -0500
Subject: [PATCH] no font is fatal to pngs, not a warning

---
 drawing/png.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drawing/png.go b/drawing/png.go
index 7c3819f..e03db7e 100644
--- a/drawing/png.go
+++ b/drawing/png.go
@@ -54,6 +54,9 @@ func (s *Settings) DrawPNG(w io.Writer, dpi float64, changelist []string, g *dat
 		s.TextPadding *= dpiScale
 		s.dpi = dpi
 	}
+	if theFont == nil {
+		log.Fatalf("no font loaded - cannot make PNG!")
+	}
 	d := s.prepare(changelist, g)
 	d.png(w)
 }