Fix missing notdef in expert encoding.

src/core/encodings.js

@@ -24,7 +24,7 @@ var ExpertEncoding = [
   'sixoldstyle', 'sevenoldstyle', 'eightoldstyle', 'nineoldstyle', 'colon',
   'semicolon', 'commasuperior', 'threequartersemdash', 'periodsuperior',
   'questionsmall', '', 'asuperior', 'bsuperior', 'centsuperior', 'dsuperior',
-  'esuperior', '', '', 'isuperior', '', '', 'lsuperior', 'msuperior',
+  'esuperior', '', '', '', 'isuperior', '', '', 'lsuperior', 'msuperior',
   'nsuperior', 'osuperior', '', '', 'rsuperior', 'ssuperior', 'tsuperior',
   '', 'ff', 'fi', 'fl', 'ffi', 'ffl', 'parenleftinferior', '',
   'parenrightinferior', 'Circumflexsmall', 'hyphensuperior', 'Gravesmall',

test/pdfs/.gitignore

@@ -191,6 +191,7 @@
 !issue6336.pdf
 !issue6387.pdf
 !issue6410.pdf
+!issue8586.pdf
 !gradientfill.pdf
 !bug903856.pdf
 !bug850854.pdf

test/test_manifest.json

@@ -1604,6 +1604,13 @@
        "rounds": 1,
        "type": "eq"
     },
+    {  "id": "issue8586",
+       "file": "pdfs/issue8586.pdf",
+       "md5": "16b5230364017d3b0d2d65978eb35816",
+       "link": false,
+       "rounds": 1,
+       "type": "eq"
+    },
     {  "id": "issue7101",
        "file": "pdfs/issue7101.pdf",
        "md5": "cc9cabe12ac9ad49e5372ef33d10aeb4",