Ignoring glyphs without points

src/core/fonts.js

@@ -3164,6 +3164,10 @@ var Font = (function FontClosure() {
             coordinatesLength += repeat * xyLength;
           }
         }
+        // glyph without coordinates will be rejected
+        if (coordinatesLength === 0) {
+          return 0;
+        }
         var glyphDataLength = j + coordinatesLength;
         if (glyphDataLength > glyf.length) {
           // not enough data for coordinates

test/pdfs/.gitignore

@@ -21,6 +21,7 @@
 !devicen.pdf
 !cmykjpeg.pdf
 !issue840.pdf
+!issue3438.pdf
 !issue2074.pdf
 !scan-bad.pdf
 !pdfjsbad1586.pdf

test/test_manifest.json

@@ -1288,6 +1288,12 @@
       "rounds": 1,
       "type": "eq"
     },
+    {  "id": "issue3438",
+      "file": "pdfs/issue3438.pdf",
+      "md5": "5aa3340b0920b65a377f697587668f89",
+      "rounds": 1,
+      "type": "eq"
+    },
     {  "id": "bug886717",
       "file": "pdfs/bug886717.pdf",
       "md5": "8ba614192797a1324765610231a1bc9d",