Handle case that rcjk font has .notdef already

font.py

@@ -4,7 +4,9 @@
 async def createFontBuilder(rcjkfont, family_name, style, glyphs, glyphDataFormat=0):
     upem = await rcjkfont.getUnitsPerEm()
 
-    glyphOrder = [".notdef"] + list(glyphs.keys())
+    glyphOrder = list(glyphs.keys())
+    metrics = {}
+
     revCmap = await rcjkfont.getGlyphMap()
     cmap = {}
     for glyph in glyphs.values():
@@ -13,14 +15,17 @@ async def createFontBuilder(rcjkfont, family_name, style, glyphs, glyphDataForma
             # assert unicode not in cmap, (hex(unicode), glyphname, cmap[unicode])
             cmap[unicode] = glyph.name
 
-    metrics = {".notdef": (upem, 0)}
-    for glyphname in glyphOrder[1:]:
+    for glyphname in glyphOrder:
         glyph = await rcjkfont.getGlyph(glyphname)
         assert glyph.sources[0].name == "<default>"
         assert glyph.sources[0].layerName == "foreground"
         advance = glyph.layers["foreground"].glyph.xAdvance
         metrics[glyphname] = (max(advance, 0), 0)  # TODO lsb
 
+    if ".notdef" not in glyphOrder:
+        glyphOrder.insert(0, ".notdef")
+        metrics[".notdef"] = (upem, 0)
+
     nameStrings = dict(
         familyName=dict(en=family_name),
         styleName=dict(en=style),